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Eschmeyer's Catalog of Fishes
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Species in the family or subfamily Cottidae: [ 212 ] records


abyssalis, Asprocottus herzensteini Taliev [D. N.] 1955:322, Figs. 128-129 [ ref. 4316] Lake Baikal, Russia, depth below 450 meters. Syntypes: ZIN (none found in 1996). Taliev specimens: ZIN 46867 (1), ? 46633 (1). Appeared without distinguishing features and not available in Taliev in Taliev & Koryakov 1947:1838 [ref. 6543]. Sideleva 2001:58 [ref. 26181] names a neotype [ZIN 46633], but if that is the first time a neotype was named it is unavailable under the Code. That neotype repeated in Sideleva 2003:181 [ref. 27815]. •Valid as Asprocottus abyssalis Taliev 1955 -- (Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702] with authorship and date as Taliev & Korjakov 1947, Sideleva 1998:155 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178] with authorship and date as Taliev & Korjakov 1947, Sideleva 2001:61 [ref. 26181] with authorship as Taliev & Korjakov 1947, Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 181 [ref. 27815] with authorship as Taliev & Korjakov 1947, Bogutskaya & Naseka 2004:194 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:118 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus abyssalis Taliev 1955. Cottidae. Distribution: North Asia: southern part of Lake Baikal (Russia). Habitat: freshwater.

affinis, Cottus Heckel [J. J.] 1837:150 [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Mörkö Island, near Stockholm, Sweden. Syntypes: whereabouts unknown. •Synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952], Freyhof et al. 2005:124, 132 [ref. 28259]). Current status: Synonym of Cottus gobio Linnaeus 1758. Cottidae. Habitat: freshwater, brackish.

aleuticus, Cottus Gilbert [C. H.] 1896:418 [United States Commission of Fish and Fisheries, Report of the Commissioner v. 19 (for 1893) (art. 6); ref. 1628] Streams at Iliuliuk, Unalaska, Bering Sea. Syntypes: ANSP 39139 (1); BMNH 1896.7.23.59 (1), 1897.1.12.11-12 (2), 1900.7.11.2 (1); MCZ 28368 (1); ?NMW; CAS-SU 2610 (19); USNM 48716 (1); ZMUO J1417 (1). Type catalog: Böhlke 1953:128 [ref. 12291], Pethon 1969:7 [ref. 19268], Böhlke 1984:65 [ref. 13621]. •See Coffie 1998:126 [ref. 24964]. •Valid as Cottus aleuticus Gilbert 1896 -- (Lee et al. 1980:801 [ref. 22416], McAllister 1990:196 [ref. 14674], Page & Burr 1991:247 [ref. 18983], Swift et al. 1993:129 [ref. 22379], Chereshnev 1996:605 [ref. 24659], Scott & Crossman 1998:820 [ref. 24570], Mecklenburg et al. 2002:470 [ref. 25968], Moyle 2002:349 [ref. 26449], Wydoski & Whitney 2003:201 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:450 [ref. 31199], Scharpf 2008:7 [ref. 30399], Page & Burr 2011:471 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456], Pietsch & Orr 2015:40 [ref. 34694], Kells et al. 2016:168 [ref. 35888]). Current status: Valid as Cottus aleuticus Gilbert 1896. Cottidae. Distribution: Eastern North Pacific: Bristol Bay, Alaska Peninsula, and Aleutian Islands to California. Habitat: freshwater, brackish.

alexandrae, Cottocomephorus grewingki Taliev [D. N.] 1935:64, Pl. 1 (fig. 4) [Trudy Baikal'skoi limnologischeskoi stantsii = Travaux de la Station limnologique du Lac Baikal v. 6; ref. 15741] Lake Baikal near Marituy village, Russia, depth 500 meters. Syntypes: (7, ex Baikal Limnological Station) ZIN (none found in 1996 and not in The Baikal Museum). Original grewingki should have been grewingkii. Sideleva 2001:58 [ref. 26181] and 2003:165 [ref. 27815] names a lectotype [ZIN 36608] (in 2006 called neotype), but that specimen was not captured until 1949; it would probably make the best neotype if one is needed. •Synonym of Cottocomephorus grewingkii (Dybowski 1874), but a valid subspecies as described -- (Taliev 1955:287 [ref. 4316], Sideleva 1998:150 [ref. 23595]). •Synonym of Cottocomephorus grewingkii (Dybowski 1874) -- (Berg 1949:1173 [ref. 20662] as grewingki, Bogdanov 2019:231 [ref. 36814]). •Valid as Cottocomephorus alexandrae Taliev 1935 -- (Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Sideleva 2003:16, 165 [ref. 27815], Bogutskaya & Naseka 2004:192 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Cottocomephorus alexandrae Taliev 1935. Cottidae. Distribution: North Asia: Lake Baikal, but mainly in northern part (Russia). Habitat: freshwater.

altaicus, Cottus poecilopus Kaschenko [N.] 1899:151 [Results of the Altai Zoological Expedition; ref. 19630] Katun River, Bol'shoi Uiman, Katun River basin, Altai, Siberia, Russia. Neotype: ZIN 53968. Syntypes: (15) whereabouts unknown. Syntypes (15) lost; neotype selected by Sideleva & Goto 2009:601 [ref. 30591]. •Synonym of Cottus poecilopus Heckel 1837 -- (Freyhof et al. 2005:167 [ref. 28259]). •Valid as Cottus altaicus Kaschenko 1899 -- (Bogutskaya & Naseka 2004:185 [ref. 28183], Kottelat 2006:90 [ref. 28831], Sideleva & Goto 2009:601 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241 [ref. 33547], Romanov et al. 2017:826 [ref. 35687], Dyldin et al. 2020:114 [ref. 37569]). Current status: Valid as Cottus altaicus Kaschenko 1899. Cottidae. Distribution: North Asia: rivers of the Upper and Middle Ob River basin, western Siberia (Russia). Habitat: freshwater, brackish.

altaicus, Cottus sibiricus Li [S.-C.] & Ho [C.-W.] in Li, Tai, Chang, Ma, Ho & Kao 1966:49 (English p. 55), Fig. 2 [Acta Zoologica Sinica v. 18 (no. 1); ref. 9042] Altai, northern Sinkiang, China. Holotype: ASZIB [now NZMC] 56824 [ex NK 64-997]. Paratypes: ASZIB [now NZMC] 56825 [ex ZB 64-1085]; ZB 64-979 to 980 (2), 64-983 to 985 (3), 64-988 (1), 64-992 (1); Acad. Sinica, Sinkiang, Bureau of Water Conservancy and Dept. Biol. Sinkiang Univ. 64-981 to 982 (2), 64-986 to 987 (2), 64-989 to 991 (3). Type catalog: Ye et al. 2015:96 [ref. 33808]. Objectively invalid; preoccupied by Cottus poecilopus altaicus Kashchenko 1899. Replaced by Cottus dzungaricus Kottelat 2006:60 [ref. 28831]. •Incorrectly treated as valid -- (Zhu 1995:189 [ref. 25213]). •Synonym of Cottus dzungaricus Kottelat 2006 -- (Ye et al. 2015:96 [ref. 33808]). •Synonym of Cottus sibiricus, subspecies altaicus Li & Ho 1966 -- (Zhang et al. 2016:193 [ref. 34477] as altieus). 1°Homonym. Current status: Synonym of Cottus dzungaricus Kottelat 2006. Cottidae. Habitat: freshwater.

alvordii, Cottus Girard [C. F.] 1851:46, Pl. 1 (figs. 7-8) [Smithsonian Contributions to Knowledge v. 3 (art. 3) (for 1850); ref. 18124] Fort Gratiot, Lake Huron, Michigan, U.S.A. Holotype (unique): USNM. •Synonym of Cottus bairdii Girard 1850. Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

amblystomopsis, Cottus Schmidt [P. Yu.] 1904:89, Pl. 2 (figs. 1-3) [Fishes of the eastern seas of the Russian Empire; ref. 3946] Lyutoga River, Sakhalin Island, Russia. Holotype (unique): ZIN 12763. •Valid as Cottus amblystomopsis Schmidt 1904 -- (Berg 1949:1142 [ref. 20662], Yabe in Masuda et al. 1984:326 [ref. 6441], Lindberg & Krasyukova 1987:171 [ref. 15964], Andoh & Goto 1988:176 [ref. 22495], Kawanabe & Mizuno 1989:660 [ref. 25598], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:150 [ref. 23595], Nakabo 2000:638 [ref. 25086], Goto et al. 2001:70 [ref. 25596], Pietsch et al. 2001:144 [ref. 25688], Bogutskaya et al. 2001:46 [ref. 26178], Nakabo 2002:638 [ref. 26001], Parin et al. 2002:S72 [ref. 28300], Bogutskaya & Naseka 2004:186 [ref. 28183], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241 [ref. 33547], Dyldin & Orlov 2017:62 [ref. 35138], Dyldin et al. 2021:62 [ref. 38804]). Current status: Valid as Cottus amblystomopsis Schmidt 1904. Cottidae. Distribution: Northwestern Pacific. Habitat: freshwater, brackish, marine.

annae, Cottus Jordan [D. S.] & Starks [E. C.] in Jordan 1896:223, Pl. 27 [Proceedings of the California Academy of Sciences (Series 2) v. 6; ref. 2395] Eagle River at Gypsum, Colorado, U.S.A. Syntypes: CAS-SU 1305 and 1308-10 [but all in 1309] (4). Type catalog: Böhlke 1953:128 [ref. 12291]. Lectotype established in Jordan 1896:244 [ref. 2395] if specimen is identifiable. •Synonym of Cottus beldingii Eigenmann & Eigenmann 1891 -- (Bailey & Bond 1963:1 [ref. 3934], Lee et al. 1980:806 [ref. 22416]). Current status: Synonym of Cottus beldingii Eigenmann & Eigenmann 1891. Cottidae. Habitat: freshwater.

ansatus, Centridermichthys Richardson [J.] 1845:74, Pl. 54 (figs. 6-10) [Ichthyology.--Part 2. The zoology of the voyage of H. M. S. Sulphur; ref. 20574] Harbor of Woosung, mouth of the Yangtze Kiang Kew, northern China, 31°N. Syntypes: BMNH 2020.4.17.2-3 (2) [ex BMNH 1865.5.13]. •Placed in synonymy of Cottus uncinatus Temminck & Schlegel 1843 by Richardson 1845 (Oct.):150 [ref. 20575]. •Synonym of Trachidermus fasciatus Heckel 1837 -- (Okada 1961:709 [ref. 6363], Choi et al. 2003:573 [ref. 26218]). •Not treated in Zhang et al. 2016:194 [ref. 34477]. Current status: Synonym of Trachidermus fasciatus Heckel 1837. Cottidae. Habitat: brackish, marine.

arachlensis, Paracottus kessleri Tarkhova [Yu. N.] 1962:103 [Kratkiie soobscenjia Burjatskij Kompleksnogo Naucno-Issledovatel'skogo Instituta, Akademija Nauk SSR, Sibirskoe Otdelenie, Burjatskij Kompleksnyi Nauno-Issledovatel'skij Institut. No. 3; ref. 22756] Lake Arakhlei, Lake Baikal Basin, Russia. Neotype: ZIN 34220. Original not seen. Neotype designated by Sideleva 2003:154 [ref. 27815]. •Synonym of Cottus kesslerii Dybowski 1874, but a valid subspecies -- (Sideleva 1982 [ref. 14469], Sideleva 1998:152 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874), but a valid subspecies arachlensis (Tarkhova 1962) as described -- (Sideleva 2001:60 [ref. 26181], Sideleva 2003:154 [ref. 27815], Kottelat 2006:60 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

armatus, Leptocottus Girard [C. F.] 1854:131 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 7; ref. 1817] San Francisco, California, U.S.A. Syntypes: MCZ 36019 [ex USNM 310] (1), ?UMMZ 143015 (1, missing), USNM 310 (4). •Valid as Leptocottus armatus Girard 1854 -- (Bolin 1944:97 [ref. 6379], Lee et al. 1980:825 [ref. 22416], Eschmeyer & Herald 1983:175 [ref. 9277], Matarese et al. 1989:446 [ref. 26885], McAllister 1990:199 [ref. 14674], Swift et al. 1993:132 [ref. 22379], Castro-Aguirre et al. 1999:247 [ref. 24550], Mecklenburg et al. 2002:467 [ref. 25968], Moyle 2002:361 [ref. 26449], Wydoski & Whitney 2003:215 [ref. 27816], Nelson et al. 2004:120 [ref. 27807], Miller 2006:325 [ref. 28615], Page et al. 2013:124 [ref. 32708], Goto et al. 2014:[9] [ref. 33456], Pietsch & Orr 2015:43 [ref. 34694], Kells et al. 2016:180 [ref. 35888], Burton & Lea 2019:67 [ref. 37205]). Current status: Valid as Leptocottus armatus Girard 1854. Cottidae. Distribution: Northeastern Pacific: southeastern Bering Sea south to northern Baja California (Mexico). Habitat: brackish, marine.

asper, Cottus Richardson [J.] (ex Gairdner) 1836:295, 313, Pl. 95 (fig. 1) [Fauna Boreali-Americana Part 3; ref. 3731] Columbia River at Fort Vancouver, southern Washington, U.S.A. Holotype (unique) (?): BMNH 2020.4.17.4. Apparent holotype is at the BMNH (pers. comm. from C. Bond, 6/99). •Valid as Cottus asper Richardson 1836 -- (Lee et al. 1980:802 [ref. 22416], Eschmeyer & Herald 1983:167 [ref. 9277], Matarese et al. 1989:444 [ref. 26885], McAllister 1990:196 [ref. 14674], Page & Burr 1991:247 [ref. 18983], Swift et al. 1993:127 [ref. 22379], Scott & Crossman 1998:823 [ref. 24570], Fuller et al. 1999:339 [ref. 25838], Mecklenburg et al. 2002:469 [ref. 25968], Moyle 2002:346 [ref. 26449], Wydoski & Whitney 2003:203 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:457 [ref. 31199], Scharpf 2008:7 [ref. 30399], Page & Burr 2011:472 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456], Pietsch & Orr 2015:40 [ref. 34694], Kells et al. 2016:168 [ref. 35888]). Current status: Valid as Cottus asper Richardson 1836. Cottidae. Distribution: Eastern North Pacific/western North America: Seward, Alaska, to Ventura River, southern California, U.S.A. Habitat: freshwater, brackish, marine.

asperrima, Cottus Rutter [C. L.] 1908:144, Fig. 3 [Bulletin of the Bureau of Fisheries v. 27 (Doc. 637) (for 1907); ref. 12415] Fall River at Dana and Fall River Mills, California, U.S.A. Holotype: USNM 58500. Paratypes: (5) CAS-SU 9968 (2), USNM 126463 (1). Type catalog: Böhlke 1953:128 [ref. 12291]. •Valid as Cottus asperrimus Rutter 1908 -- (Lee et al. 1980:803 [ref. 22416], Page & Burr 1991:249 [ref. 18983], Moyle 2002:360 [ref. 26449], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:7 [ref. 30399], Page & Burr 2011:474 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus asperrimus Rutter 1908. Cottidae. Distribution: California, U.S.A. Habitat: freshwater.

aturi, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:132, Fig. 12 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] Adour drainage, Dept. Hautes-Pyrénées, River Adour in Tarbes (Séméac), 43°19'39"B, 0°05'27"E, France. Holotype: MNHN 2005-0750. Paratypes: CMK 17577 (5), 18327 (7); FSFJ 1653 (2); MNHN 2005-0751 (3), 2005-0752 (2). Name is a noun in apposition. •Valid as Cottus aturi Freyhof, Kottelat & Nolte 2005 -- (Goto et al. 2014:[10] [ref. 33456], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus aturi Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Adour and Nivelle drainages, France and Spain. Habitat: freshwater.

australis, Icelinus Eigenmann [C. H.] & Eigenmann [R. S.] 1889:131 [8] [West American Scientist v. 6 (no. 48); ref. 1251] Cortez Banks, off San Diego, California, U.S.A., depth 45 fathoms. Syntypes: BMNH 1891.5.19.59 (1, poor condition), USNM 41917 (1, poor condition). On p. 8 of separate. See Bolin 1936:159 [ref. 506]. •Unidentifiable, not an Icelinus -- (Rosenblatt & Smith 2004:560 [ref. 27912]). Cottidae. Habitat: marine.

australis, Leptocottus armatus Hubbs [C. L.] 1921:5 [Occasional Papers of the Museum of Zoology University of Michigan No. 94; ref. 19137] Lagoon at the mouth of Ventura River at Ventura, California, U.S.A. Holotype: UMMZ 55055. Paratypes: FMNH 1954 (4), 9109-10 (112, 3), 9140-41 (17, 1), 9143 (27), 9149 (3), 9163-64 (3, 1), 9166 (1); UMMZ ?80367 (7), 142922-25 (12, 2, 8, 20), 142927-28 (3, 1). Type catalog: Ibarra & Stewart 1987:52 [ref. 12367]. •Synonym of Leptocottus armatus Girard 1854 -- (Lee et al. 1980:825 [ref. 22416], Castro-Aguirre et al. 1999:247 [ref. 24550]). •Synonym of Leptocottus armatus Girard 1854, but a valid subspecies as described -- (Ruiz-Campos et al. 2000:71 [ref. 24940]). Current status: Synonym of Leptocottus armatus Girard 1854. Cottidae. Habitat: brackish, marine.

baicalensis, Cottus Dybowski [B. N.] 1874:386, Pl. 3 (fig. 2) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal, Russia. Syntypes: ZMB 7810 (4). Type catalog: Paepke & Fricke 1992:284 [ref. 19946]. •Valid as Batrachocottus baicalensis (Dybowski 1874) -- (Berg 1949:1165 [ref. 20662], Taliev 1955:257 [ref. 4316], Sideleva 1982:28 [ref. 14469], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:149 [ref. 23595], Sideleva 1999:149 [ref. 24864], Vasil'eva 1999:154 [ref. 24864], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:15, 154 [ref. 27815], Bogutskaya & Naseka 2004:196 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], northern Kuril Islands and southern Kamchatka). Current status: Valid as Batrachocottus baicalensis (Dybowski 1874). Cottidae. Distribution: North Asia: Lake Baikal, Russia. Habitat: freshwater.

baikalensis, Callionymus Pallas [P. S.] 1776:290, 707 [Reise durch verschiedene Provinzen des russischen Reiches; ref. 18509] Lake Baikal, Russia. Neotype: ZIN 16321. Originally as baïkalensis. Also described as new in Pallas 1787:258, Pl. 9 (figs. 2-3) [ref. 18506] as baicalensis, and Pallas 1787:349, Pl. 9 (figs. 2-3) [ref. 18507] as baicalensis. Sideleva 2001:58 [ref. 26181] names a neotype [ZIN 16321], but if that is the first time a neotype was named it is unavailable under the Code; same neotype mentioned in Sideleva 2003:171 [ref. 27815]. •Valid as Comephorus baicalensis [sic] (Pallas 1776) -- (Berg 1949:1175 [ref. 20662], Taliev 1955:367 [ref. 4316], Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:154 [ref. 23595], Yabe & Sideleva 2000:306 [ref. 25698], Bogutskaya et al. 2001:46 [ref. 26178], Fricke 2002:72 [ref. 26547] as baikalensis, Sideleva 2001:60 [ref. 26181], Kontula et al. 2003:149 [ref. 26791] as baicalensis, Sideleva 2003:16, 171 [ref. 27815] as baicalensis, Bogutskaya & Naseka 2004:193 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Comephorus baikalensis (Pallas 1776). Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

baileyi, Cottus Robins [C. R.] 1961:311, Figs. 1b, c [Copeia 1961 (no. 3); ref. 9373] Middle fork of Holston River, 6 miles east-northeast of Marion, Smyth County, Virginia, U.S.A. Holotype: CUMV 25914. Paratypes: CUMV 22849 (58), 25915 (1, allotype); UMMZ 167171 (17). Additional material: CUMV 19179 (10), 21512 (4), 24418 (7); UMMZ 129084 (1), 129106 (1), 157471 (29); USNM 102433 (1). •Valid as Cottus baileyi Robins 1961 -- (Lee et al. 1980:804 [ref. 22416], Page & Burr 1991:250 [ref. 18983], Jenkins & Burkhead 1994:644 [ref. 21581], Kinziger et al. 2000:1007 [ref. 25019], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:7 [ref. 30399], Page & Burr 2011:476 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus baileyi Robins 1961. Cottidae. Distribution: Upper Tennessee River drainage, Virginia and Tennessee, U.S.A. Habitat: freshwater.

bairdii, Cottus Girard [C. F.] 1850:410 [Proceedings of AAAS (The American Association for the Advancement of Science) 2nd meeting, 1849; ref. 18123] Mahoning River, Portland, Ohio; tributaries to Ohio River in Pennsylvania, U.S.A. Syntypes: none known. See also Girard 1850:189 [ref. 1814]. •Valid as Cottus bairdii Girard 1850 [often incorrectly as bairdi; sometimes with subspecies] -- (Bailey & Bond 1963:1 [ref. 3934] as bairdi, Lee et al. 1980:805 [ref. 22416], Smith 1986:355 [ref. 22186], McAllister 1990:196 [ref. 14674] as bairdi, Page & Burr 1991:250 [ref. 18983], Boschung 1992:102 [ref. 23239], Etnier & Starnes 1993:384 [ref. 22809], Jenkins & Burkhead 1994:639 [ref. 21581], La Rivers 1994:585 [ref. 23389], Baxter & Stone 1995:220 [ref. 23374], Stauffer et al. 1995:250 [ref. 23376], Andersen & Deacon 1996:124 [ref. 24717], Chereshnev 1996:605 [ref. 24659], Mettee et al. 1996:491 [ref. 25836], Sigler & Sigler 1996:230 [ref. 25943], Scott & Crossman 1998:826 [ref. 24570] as bairdi, Fuller et al. 1999:340 [ref. 25838] as bairdi, Broughton 2000:653 [ref. 24593] as bairdi, Lyons et al. 2000:42 [ref. 26594] as bairdi, Markle & Hill 2000:202 [ref. 24886] as bairdi, Kinziger et al. 2000:1007 [ref. 25019], Gasper et al. 2001:264 [ref. 25578] as bairdi, Wydoski & Whitney 2003:205 [ref. 27816] as bairdi, Bailey et al. 2004:170 [ref. 27882], Nelson et al. 2004:119 [ref. 27807], Boschung & Mayden 2004:419 [ref. 27995], Robins 2005:4 [ref. 28230], McPhail 2007:463 [ref. 31199], Scharpf 2008:7, 9 [ref. 30399], Minckley & Marsh 2009:308 [ref. 31114] as bairdi, Kinziger & Wood 2010:59 [ref. 30701], Page & Burr 2011:475 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134] as cf. bairdii, Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus bairdii Girard 1850. Cottidae. Distribution: Widespread in North America. Habitat: freshwater.

bauntovi, Cottus kessleri Taliev [D. N.] 1946:744, Fig. 2 [Doklady Akademii Nauk SSSR, Ser. A (Comptes Rendus de l'Académie des Sciences de l'URSS), Leningrad v. 52 (no. 8); ref. 13135] Baunt Lake, east of Lake Baikal, Vitim River basin, Buryatia, Russia. Syntypes: (3) not at ZIN. Evidently type locality is in error. •Synonym of Paracottus kessleri (Dybowski 1874), but a valid subspecies as described -- (Taliev 1955:249 [ref. 4316]). •Synonym of Cottus kesslerii Dybowski 1874 -- (Sideleva 1998:151 [ref. 23595]). •Synonym of Cottus kesslerii Dybowski 1874, but a valid subspecies as described -- (Berg 1949:1154 [ref. 20662]). •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 151 [ref. 27815], Kottelat 2006:60 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

beldingii, Cottus Eigenmann [C. H.] & Eigenmann [R. S.] 1891:1132 [American Naturalist v. 25 (no. 300); ref. 11063] Lake Tahoe and Donner Lake, California, U.S.A. Syntypes: BMNH 1890.11.15.94-97 (4), 1890.11.15.98-101 (4); not CAS 504, 505, and 702; UMMZ 92669 (2). CAS type specimens would have been lost in the fire of 1906. •Valid as Cottus beldingii Eigenmann & Eigenmann 1891 [often incorrectly as beldingi] -- (Bailey & Bond 1963:1 [ref. 3934] as beldingi, Lee et al. 1980:806 [ref. 22416], Page & Burr 1991:251 [ref. 18983], La Rivers 1994:588 [ref. 23389], Baxter & Stone 1995:222 [ref. 23374], Sigler & Sigler 1996:232 [ref. 25943] as beldingi, Moyle 2002:357 [ref. 26449] as beldingi, Wydoski & Whitney 2003:206 [ref. 27816] as beldingi, Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:8 [ref. 30399], Page & Burr 2011:479 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus beldingii Eigenmann & Eigenmann 1891. Cottidae. Distribution: Western U.S.A. Habitat: freshwater.

bendirei, Potamocottus Bean [T. H.] 1881:27 [Proceedings of the United States National Museum v. 4 (no. 190); ref. 16046] Rattlesnake Creek near Camp Harney, Oregon, U.S.A. Holotype (unique): USNM 24196. •Synonym of Cottus bairdii Girard 1850 -- (Bailey & Bond 1963:1 [ref. 3934]). •Valid as Cottus bendirei (Bean 1881) -- (Markle & Hill 2000:202 [ref. 24886], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:476 [ref. 31199] with question, Scharpf 2008:8 [ref. 30399], Page & Burr 2011:479 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus bendirei (Bean 1881). Cottidae. Distribution: Northwestern U.S.A.: Oregon, Idaho, and questionably in s. Canada [on ref. 31199]; usually as Oregon only. Habitat: freshwater.

bergi, Limnocottus godlewskii var. Dybowski [B. N.] 1908:555 [20], Fig. 15 [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Syntypes: whereabouts unknown. Type specimen ? ZIN 13744. Incorrectly replaced by Limnocottus plathyrhynchus by Bogdanov 2007 in unpublished preprint. •Synonym of Limnocottus godlewskii (Dybowski 1874) -- (Berg 1949:1160 [ref. 20662]). •Valid as Limnocottus bergi Dybowski 1908 -- (Bogdanov 2017:47 [ref. 37119]). Current status: Valid as Limnocottus bergi Dybowski 1908. Cottidae. Distribution: Lake Baikal, Russia. Habitat: freshwater.

bergianus, Limnocottus Taliev [D. N.] 1935:61, Pl. 1 (fig. 1), Pl. 2 [Trudy Baikal'skoi limnologischeskoi stantsii = Travaux de la Station limnologique du Lac Baikal v. 6; ref. 15741] Off Listvenichnoe, depth about 700 meters, and Barjuzin Bay, depth 619 meters, southern Lake Baikal, Russia. Lectotype: ZIN 32562. Paralectotypes and/or Taliev specimens: ZIN 32562 (1). Lectotype apparently designated by Sideleva 2001:68 [ref. 26181] but not in conformance with the fourth edition of the Code. •Valid as Abyssocottus bergianus (Taliev 1935) -- (Taliev 1955:362 [ref. 4316]). •Valid as Limnocottus bergianus Taliev 1935 -- (Berg 1949:1161 [ref. 20662], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:156 [ref. 23595], Sideleva 2001:68 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 196 [ref. 27815], Bogutskaya & Naseka 2004:198 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2017:47 [ref. 37119], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Limnocottus bergianus Taliev 1935. Cottidae. Distribution: North Asia: open parts of central and southern Lake Baikal (Russia). Habitat: freshwater.

bicolor, Procottus jeittelesi var. Dybowski [B. N.] 1908:557 [22], Fig. 18 [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Syntypes: whereabouts unknown. •Synonym of Procottus jeittelesii (Dybowski 1874) -- (Berg 1949:1168 [ref. 20662]). Current status: Synonym of Procottus jeittelesii (Dybowski 1874). Cottidae. Distribution: Lake Baikal, Russia. Habitat: freshwater.

boleoides, Cottus Girard [C. F.] 1850:411 [Proceedings of AAAS (The American Association for the Advancement of Science) 2nd meeting, 1849; ref. 18123] Windsor, Vermont, U.S.A. See also Girard 1850:189 [ref. 1814] and Girard 1851:56, Pl. 2 (figs. 7-8) [ref. 18124]. •Synonym of Cottus cognatus Richardson 1836. Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

boulengeri, Abyssocottus Berg [L. S.] 1906:908 [Zoologischer Anzeiger v. 30 (no. 26); ref. 265] Lake Baikal, Russia. Syntypes: whereabouts unknown. Type catalog: Sideleva & Zhidkov 2021:231 [ref. 38705]. Sideleva 2001:68 [ref. 26181] lists ZIN 13736 as holotype. •Valid as Cottinella boulengeri (Berg 1906) -- (Berg 1949:1159 [ref. 20662], Taliev 1955:341 [ref. 4316], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:156 [ref. 23595], Sideleva 2001:68 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 189 [ref. 27815], Bogutskaya & Naseka 2004:197 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569], Sideleva & Zhidkov 2021:231 [ref. 38705]). Current status: Valid as Cottinella boulengeri (Berg 1906). Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

brevis, Asprocottus herzensteini var. Taliev [D. N.] 1948:113 [Trudy Baikal'skoi Limnologicheskoi Stantsii v. 12; ref. 19628] Not available, manuscript name mentioned in table; described as a new subspecies, Asprocottus herzensteini platycephalus in Taliev 1955:324 [ref. 4316]. •In the synonymy of Asprocottus pulcher Taliev 1955 -- (Sideleva 2003:17 [ref. 27815]). Nomen Nudum. Current status: Synonym of Asprocottus pulcher Taliev 1955. Cottidae.

caeruleomentum, Cottus Kinziger [A. P.], Raesly [R. L.] & Neely [D. A.] 2000:1009, Figs. 1-2 [Copeia 2000 (no. 4); ref. 25019] Evitts Creek at I68 bridge, east of Cumberland, Potomac River drainage, Allegany County, Maryland, U.S.A., 39°40'21.322"N, 78°43'25.728"W. Holotype: USNM 350112. Paratypes: USNM 350113 (41). •Valid as Cottus caeruleomentum Kinziger, Raesly & Neely 2000 -- (Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:8 [ref. 30399], Page & Burr 2011:476 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus caeruleomentum Kinziger, Raesly & Neely 2000. Cottidae. Distribution: Eastern U.S.A. Habitat: freshwater.

carolinae, Potamocottus Gill [T. N.] 1861:41 [Proceedings of the Boston Society of Natural History v. 8 (1861-1862); ref. 1785] Maysville, Kentucky, U.S.A. Syntypes: MCZ 33438 (1), USNM 2859 (lost). •Valid as Cottus carolinae (Gill 1861) -- (Lee et al. 1980:807 [ref. 22416], Robison & Buchanan 1988:476 [ref. 23393], Page & Burr 1991:246 [ref. 18983], Boschung 1992:102 [ref. 23239], Etnier & Starnes 1993:386 [ref. 22809], Jenkins & Burkhead 1994:665 [ref. 21581], Stauffer et al. 1995:251 [ref. 23376], Cross & Collins 1995:183 [ref. 23394], Mettee et al. 1996:493 [ref. 25836], Ross et al. 2001:390 [ref. 25978], Nelson et al. 2004:119 [ref. 27807], Miller & Robison 2004:284 [ref. 27931], Robins 2005:4 [ref. 28230], Proudlove 2006:189 [ref. 28992], Neely et al. 2007:651 [ref. 29262] as "c. carolinae", Scharpf 2008:8 [ref. 30399] with subspecies and remarks, Kinziger & Wood 2010:59 [ref. 30701], Page & Burr 2011:470 [ref. 31215] with 3 subspecies, Adams et al. 2013:491 [ref. 32429], Page et al. 2013:122 [ref. 32708],. Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus carolinae (Gill 1861). Cottidae. Distribution: Eastern U.S.A. Habitat: freshwater.

cayuga, Cottus gracilis Meek [S. E.] 1889:315 [Annals of the New York Academy of Sciences v. 4 (art. 13) (for 1888); ref. 12390] Cayuga Lake, New York, U.S.A. •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

centropleura, Uranidea semiscabra var. Eigenmann [C. H.] & Eigenmann [R. S.] 1889:149 [12] [West American Scientist v. 6 (no. 49) (for Nov. 1889); ref. 12402] Allen Springs, Lake County, California, U.S.A. Syntypes: BMNH 1891.5.19.53 [from Eigenmann] (1), USNM 41919 (1). On p. 12 of separate. •Synonym of Cottus gulosus (Girard 1854). Current status: Synonym of Cottus gulosus (Girard 1854). Cottidae. Habitat: freshwater.

cephaloides, Cottus Gray [J. E.] in Cuvier & Valenciennes 1829:194 [Histoire naturelle des poissons v. 4; ref. 998] Name mentioned in passing under Cottus ventralis, not available; from Kamchatka, Russia. Nomen Nudum. Cottidae.

chaka, Cottus Hamilton [F.] in McClelland 1839:222 [Asiatic Researches v. 19 (pt 2); ref. 2923] Not available, name only. Nomen Nudum. Cottidae.

chamberlaini, Cottus Evermann [B. W.] & Goldsborough [E. L.] 1907:308, Fig. 66 [Bulletin of the Bureau of Fisheries v. 26 (Doc. 624) (for 1906); ref. 6532] Probably from Loring, Alaska, U.S.A. Holotype: USNM 57823. Paratypes: CAS-SU 20011 (1); UMMZ 156705 [ex USNM 61052] (5); USNM 61052 (213), 124973 [ex USBF 1628 =5230] (1). Type catalog: Böhlke 1953:128 [ref. 12291]. •Synonym of Cottus cognatus Richardson 1836 -- (Lee et al. 1980:808 [ref. 22416], Mecklenburg et al. 2002:468 [ref. 25968]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

chattahoochee, Cottus Neely [D. A.], Williams [J. D.] & Mayden [R. L.] 2007:649, Fig. 1B [Copeia 2007 (no. 3); ref. 29262] 10 kilometers west-northwest of Hamilton,, Blue Springs Branch at Lower Blue Springs road, 32°42'49"N, 84°58'08"W, Harris County, Georgia, USA. Holotype: UAIC 12371.14. Paratypes: many at ANSP, AUM, GMNH, INHS, TU, UF, UMMZ and USNM. Plus many non-type specimens mentioned in Material Examined. •Valid as Cottus chattahoochee Neely, Williams & Mayden 2007 -- (Scharpf 2008:9 [ref. 30399], Page & Burr 2011:477 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus chattahoochee Neely, Williams & Mayden 2007. Cottidae. Distribution: Chattahoochee River drainage above the Fall Line in Georgia, U.S.A. Habitat: freshwater.

cognatus, Cottus Richardson [J.] 1836:40 [Fauna Boreali-Americana Part 3; ref. 3731] Great Bear Lake, Canada, 64.5°N. Syntypes: (many) MNHN 0000-6540 (1). Type catalog: Blanc & Hureau 1968:50-51 [ref. 20738]. •Valid as Cottus cognatus Richardson 1836, subspecies cognatus -- (Chereshnev et al. 2001:118 [ref. 26736]). •Valid as Cottus cognatus Richardson 1836 -- (Lee et al. 1980:808 [ref. 22416], Sideleva 1982:82 [ref. 14469], Smith 1986:356 [ref. 22186], McAllister 1990:196 [ref. 14674], Page & Burr 1991:249 [ref. 18983], Jenkins & Burkhead 1994:647 [ref. 21581], Stauffer et al. 1995:252 [ref. 23376], Chereshnev 1996:606 [ref. 24659], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595], Scott & Crossman 1998:830 [ref. 24570], Kinziger et al. 2000:1007 [ref. 25019], Lyons et al. 2000:42 [ref. 26594], Sheiko & Fedorov 2000:27 [ref. 25650], Bogutskaya et al. 2001:46 [ref. 26178], Mecklenburg et al. 2002:468 [ref. 25968], Parin et al. 2002:S72 [ref. 28300], Wydoski & Whitney 2003:207 [ref. 27816], Bailey et al. 2004:171 [ref. 27882], Nelson et al. 2004:119 [ref. 27807], Bogutskaya & Naseka 2004:186 [ref. 28183], McPhail 2007:462 [ref. 31199], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:474 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134], Goto et al. 2014:[10] [ref. 33456], Parin et al. 2014:242 [ref. 33547]). Current status: Valid as Cottus cognatus Richardson 1836. Cottidae. Distribution: Canada and U.S.A. (but eastern North Asia and Western North America and Arctic on ref. 33547). Habitat: freshwater, brackish.

comephoroides, Cottus Berg [L. S.] 1900:338 [13], Pl. 8 (fig. 3 [not 1]) [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 5; ref. 14714] Lake Baikal at Selenge River mouth, Russia, depth 255 meters. Syntypes: BMNH 1905.12.4.18 (1); ZIN 11531-32 (19, 9), 11533-35 (20, 3, 4). Type catalog: Sideleva & Zhidkov 2021:235 [ref. 38705]. On p. 13 of separate. •Synonym of Cottocomephorus inermis (Yakovlev 1890) -- (Taliev 1955:292 [ref. 4316], Sideleva 1982:29 [ref. 14469], Sideleva 1998:150 [ref. 23595], Sideleva 2003:166 [ref. 27815]). •Valid as Cottocomephorus comephoroides (Berg 1900) -- (Berg 1949:1173 [ref. 20662], Bogdanov 2019:230 [ref. 36814] with date 1901, Sideleva & Zhidkov 2021:235 [ref. 38705]). Current status: Valid as Cottocomephorus comephoroides (Berg 1900). Cottidae. Distribution: North Asia: Lake Baikal (Russia) endemic. Habitat: freshwater.

confusus, Cottus Bailey [R. M.] & Bond [C. E.] 1963:12, Figs. 1c, 3a, 4c [Occasional Papers of the Museum of Zoology University of Michigan No. 634; ref. 3934] Salmon River, tributary to Snake River, 25 miles northwest of Ketchum, Blaine County, Idaho, U.S.A. Holotype: UMMZ 177377. Paratypes: UMMZ 161840 (39). Additional material at UBC, MSU, OS, UMMZ, and UW. •Valid as Cottus confusus Bailey & Bond 1963 -- (Lee et al. 1980:809 [ref. 22416], McAllister 1990:196 [ref. 14674], Page & Burr 1991:251 [ref. 18983], Scott & Crossman 1998:835 [ref. 24570], Wydoski & Whitney 2003:209 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:469 [ref. 31199], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:480 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus confusus Bailey & Bond 1963. Cottidae. Distribution: Columbia River drainage and Puget Sound drainage, southwestern Canada and northwestern U.S.A. Habitat: freshwater.

copei, Cottus Abbott [C. C.] 1860:326 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 12; ref. 15620] Brandywine Creek tributaries in Pennsylvania, U.S.A. Holotype: ANSP 22713 (poor condition). Paratypes: ANSP 22714 (1). Type catalog: Böhlke 1984:65 [ref. 13621]. •Synonym of Cottus cognatus Richardson 1836. Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater.

czerskii, Cottus Berg [L. S.] 1913:17, Pl. [Zapiski obshchestva izucheniya Amurskogo Kraya [The Acta of the Society for the Study of the Amur Region] v. 13; ref. 14943] Sedanka River, Vladivostok, Russia. Holotype: ZIN 15853. Type catalog: Sideleva & Zhidkov 2021:236 [ref. 38705]. Second specimen mentioned on p. 21 [ZISP 14983]. •Valid as Cottus czerskii Berg 1913 -- (Berg 1949:1140 [ref. 20662], Sideleva 1982:82 [ref. 14469], Sheiko 1983:18 [ref. 37041], Lindberg & Krasyukova 1987:171 [ref. 15964], Kim & Youn 1992:60 [ref. 22287], Zhu 1995:189 [ref. 25213], Kim 1997:406 [ref. 24032], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595], Sokolovskaya et al. 1998:9 [ref. 24670], Kim & Park 2002:326 [ref. 25913], Bogutskaya et al. 2001:46 [ref. 26178], Choi et al. 2003:262, 572 [ref. 26218], Parin et al. 2002:S73 [ref. 28300], Bogutskaya & Naseka 2004:186 [ref. 28183], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:242 [ref. 33547], Zhang et al. 2016:193 [ref. 34477], Sideleva & Zhidkov 2021:236 [ref. 38705]). Current status: Valid as Cottus czerskii Berg 1913. Cottidae. Distribution: East Asia: continental coast of the Sea of Japan from Serebryanka River, Russia to the North Nandai River, Korea. Habitat: freshwater.

dabryi, Centridermichthys Sauvage [H.-E.] 1878:146, Pl. 1 (fig. 14) [Nouvelles Archives du Muséum d'Histoire Naturelle, Paris (Série 2) v. 1; ref. 3880] South China. Holotype (unique): MNHN 0000-7359. Type catalog: Blanc & Hureau 1968:49 [ref. 20738]. Cottidae. Habitat: marine.

dracunculus, Cottus Forsskål [P. S.] 1775:xviii [Descriptiones animalium (Forsskål); ref. 1351] Not available, name only; from Malta. Nomen Nudum. Cottidae.

duranii, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:136, Fig. 14 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] Stream Epie, tributary of Tryuètr. at Valette, Dept. Cantal, Dordogne drainage, France. Holotype: MNHN 2005-0754. Paratypes: CMK 18276 (3), 18270 (4); MNHN 2005-0755 (2), 2005-0756 (2). Plus non-type material. •Valid as Cottus duranii Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:508 [ref. 29996], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[10] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus duranii Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: France. Habitat: freshwater.

dybowski, Comephorus Korotneff [A. de] 1904:17, Figs. 9-10 [Archives de zoologie expérimentale et générale (Paris) ser. 4, v. 2; ref. 15188] Lake Baikal, Russia. Holotype (?): ZIN 12474. Correct spelling may be dybowski; two publications may be involved; date may be 1905. •Valid as Comephorus dybowskii Korotneff 1904 -- (Berg 1949:1176 [ref. 20662], Taliev 1955:375 [ref. 4316], Sideleva 1982:29 [ref. 14469], Sideleva 1998:154 [ref. 23595], Yabe & Sideleva 2000:306 [ref. 25698], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). •Valid as Comephorus dybowski Korotneff 1904 -- (Reshetnikov et al. 1997:759 [ref. 24702], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 172 [ref. 27815] with date as 1905, Bogutskaya & Naseka 2004:193 [ref. 28183]). Current status: Valid as Comephorus dybowskii Korotneff 1904. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

dzungaricus, Cottus Kottelat [M.] 2006:60, 90 [Fishes of Mongolia; ref. 28831] Altai, northern Sinkiang, China. Holotype: ASIZB NK 64-997. Paratypes: ASIZB 64-979 to 980 (2), 64-983 to 985 (3), 64-988 (1), 64-992 (1); Acad. Sinica, Sinkiang, Bureau of Water Conservancy and Dept. Biol. Sinkiang Univ. 64-981 to 982 (2), 64-986 to 987 (2), 64-989 to 991 (3). Relacement name for Cottus sibiricus altaicus Li & Ho 1966, preoccupied by Cottus poecilopus altaicus Kaschenko 1899. •Valid as Cottus dzungaricus Kottelat 2006 -- (Goto et al. 2014:[9] [ref. 33456]). •Possible synonym of Cottus sibiricus Warpachowski 1889 -- (Sideleva 2017:827 [ref. 35715]). Replacement Name. Current status: Valid as Cottus dzungaricus Kottelat 2006. Cottidae. Distribution: Chinese Altai, China. Habitat: freshwater.

echinatus, Cottus Bailey [R. M.] & Bond [C. E.] 1963:2, Figs. 1a, 2a, 4a [Occasional Papers of the Museum of Zoology University of Michigan No. 634; ref. 3934] Utah Lake, mouth of Provo River, Utah County, Utah, U.S.A. Holotype: UMMZ 177376. Paratypes: UMMZ 156794 (2); USNM 27414 (2), 197681 (2). •Valid as Cottus echinatus Bailey & Bond 1963 -- (Lee et al. 1980:810 [ref. 22416], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:474 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus echinatus Bailey & Bond 1963. Cottidae. Distribution: Utah Lake, Utah, U.S.A. [extinct]. Habitat: freshwater.

elegans, Limnocottus megalops Taliev [D. N.] 1948:113 [Trudy Baikal'skoi Limnologicheskoi Stantsii v. 12; ref. 19628] Not available, manuscript name mentioned in table; mentioned in synonymy in Taliev 1955:329 [ref. 4316]; from Lake Baikal. Nomen Nudum. Current status: Synonym of Asprocottus. Cottidae.

elochini, Abyssocottus Taliev [D. N.] 1955:350, Fig. 147 [ ref. 4316] Northern Lake Baikal, Russia, depth 250-300 meters. Syntypes: (3) ZIN 46661 (1). Sideleva 2001:60 [ref. 26181] lists a holotype [ZIN 46661], but that is incorrect; that specimen is a "surviving" syntype and not the holotype. •Valid as Abyssocottus elochini Taliev 1955 -- (Taliev 1955:350 [ref. 4316], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:155 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2001:60 [ref. 26181], Sideleva 2003:17, 177 [ref. 27815], Bogutskaya & Naseka 2004:194 [ref. 28183], Bogdanov 2013:96 [ref. 37118], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Abyssocottus elochini Taliev 1955. Cottidae. Distribution: North Asia: northern part of Lake Baikal (Russia). Habitat: freshwater.

emeljanovi, Cottus Lindberg [G. U.] 1927:7, fig. [Trudy Gosudarstvennogo Dal'nevostočnogo Universiteta [= Mémoires de l'Université d'Etat à l'Extrême-Orient, Serija 8, Biologia, Vladivostok] No. 2; ref. 16497] Botchi River, Primorye, southeastern Russia. Lectotype: ZIN 21988. Paralectotypes: (1). Lectotype selected by Berg 1949:1147 [ref. 20662]. •Synonym of Cottus amblystomopsis Schmidt 1904 -- (Berg 1949:1142 [ref. 20662], Sideleva 1998:150 [ref. 23595], Parin et al. 2002:S72 [ref. 28300], Parin et al. 2014:241 [ref. 33547], Dyldin & Orlov 2017:62 [ref. 35138]). Current status: Synonym of Cottus amblystomopsis Schmidt 1904. Cottidae. Habitat: freshwater, brackish, marine.

eurystomus, Asprocottus megalops Taliev [D. N.] 1955:195, 332, Figs. 70, 138-139 [ ref. 4316] Lake Baikal, Russia. Neotype: ZIN 46624. Genus Cyphocottus was not available from 2001, two included species after 1930 with no designation of a type species (Art. 13.3); dates to Sideleva 2003:193 [ref. 27815]. Neotype designation also does not conform to code requirements. •Valid as Limnocottus eurystomus (Taliev 1955) -- (Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:157 [ref. 23595]). •Valid as Cyphocottus eurystomus (Taliev 1955) -- (Sideleva 2001:67 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 193 [ref. 27815], Bogutskaya & Naseka 2004:198 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Cyphocottus eurystomus (Taliev 1955). Cottidae. Distribution: North Asia: central and southern parts of Lake Baikal (Russia). Habitat: freshwater.

evermanni, Cottus Gilbert [C. H.] 1898:11, Fig. [Bulletin of the U. S. Fish Commission v. 17 (art. 1) [1897]; ref. 12349] Lost River near Lostine, Oregon, U.S.A. Holotype (unique): USNM 48228. •Synonym of Cottus princeps Gilbert 1898 -- (Lee et al. 1980:820 [ref. 22416]). Current status: Synonym of Cottus princeps Gilbert 1898. Cottidae. Habitat: freshwater.

extensus, Cottus Bailey [R. M.] & Bond [C. E.] 1963:8, Figs. 1b, 2b, 4b [Occasional Papers of the Museum of Zoology University of Michigan No. 634; ref. 3934] Along eastern shore of Bear Lake, south of the South Eden Delta, Rich County, Utah, U.S.A. Holotype: UMMZ 141840. Paratypes: UMMZ 141841 (15). Additional material at UMMZ. •Valid as Cottus extensus Bailey & Bond 1963 -- (Lee et al. 1980:811 [ref. 22416], Page & Burr 1991:249 [ref. 18983], Sigler & Sigler 1996:235 [ref. 25943], Fuller et al. 1999:341 [ref. 25838], Broughton 2000:653 [ref. 24593], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:474 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus extensus Bailey & Bond 1963. Cottidae. Distribution: Bear Lake, Idaho/ Utah, introductions elsewhere, U.S.A. Habitat: freshwater.

fasciatus, Trachidermus Heckel [J. J.] 1837:160, Pl. 9 (fig. 2) [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Philippines [=? China]. Holotype (unique): NMW 92826. Spelled efasciatus in main heading, otherwise as fasciatus. •Valid as Trachidermus fasciatus Heckel 1837 (often dated 1839 or 1840) -- (Watanabe 1960:114 [ref. 11959], Okada 1961:709 [ref. 6363], Sideleva 1982:82 [ref. 14469], Yabe in Masuda et al. 1984:326 [ref. 6441], Kawanabe & Mizuno 1989:654 [ref. 25598], Kim & Youn 1992:62 [ref. 22287], Takita & Chikamoto 1994:123 [ref. 22342], Zhu 1995:188 [ref. 25213], Cheng & Zhou 1997:437 [ref. 26385] dated 1840, Kim 1997:408 [ref. 24032], Yue & Chen 1998:240 [ref. 26415], Onikura et al. 1999:31 [ref. 23924], Nakabo 2000:637 [ref. 25086], Wang et al. 2001:300 [ref. 26566] dated 1840, Kim & Park 2002:328 [ref. 25913], Nakabo 2002:637 [ref. 26001], Choi et al. 2003:263, 573 [ref. 26218], Goto et al. 2014:[6] [ref. 33456], Zhang et al. 2016:194 [ref. 34477]). Current status: Valid as Trachidermus fasciatus Heckel 1837. Cottidae. Distribution: Northwestern Pacific: China to Korea and Japan. Habitat: freshwater, brackish, marine.

ferrugineus, Cottus Heckel [J. J.] & Kner [R.] 1857:34, Figs. 14-15 [Die Süsswasserfische der Österreichischen Monarchie; ref. 2078] Garda Lake, Mailand, Treviso, Italy and Xegar, Dalmatia [Croatia]. Lectotype: NMW 6419. Paralectotypes: NMW 6036 (4), 6419 (? now 4), 6562-63 (2, 3), 6673 (6), 78799 (4). Appeared first as a nomen nudum in Bonaparte 1846:62. •See Lelek 1987:274 [ref. 22962]. •Synonym of Cottus gobio Linnaeus 1758 -- (Berg 1949:1145 [ref. 20662], Neelov 1973:593 [ref. 7219], Freyhof et al. 2005:132 [ref. 28259], Bianco & Delmastro 2011:6 [ref. 31648] Bianco 2013:10 [ref. 32897]). •Valid as Cottus ferrugineus Heckel & Kner 1857 -- (Kottelat 1997:169 [ref. 22952], Sideleva et al. 2015:33 [ref. 35276]). Current status: Valid as Cottus ferrugineus Heckel & Kner 1857. Cottidae. Distribution: Southern Europe. Habitat: freshwater.

formosus, Cottus Girard [C. F.] 1851:58 [Smithsonian Contributions to Knowledge v. 3 (art. 3) (for 1850); ref. 18124] Lake Ontario off Oswego, New York, U.S.A. Holotype (unique): USNM. •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186], Scott & Crossman 1998:835 [ref. 24570]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

franklini, Cottus Agassiz [L.] 1850:303 [Lake Superior; ref. 66] East and south shores of Lake Superior, North America. Syntypes: ?MCZ 35977 [ex USNM] (2). •Synonym of Cottus cognatus Richardson 1836 -- (Scott & Crossman 1998:835 [ref. 24570]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

fujiyamae, Rheopresbe Jordan [D. S.] & Starks [E. C.] 1904:270, Fig. 16 [Proceedings of the United States National Museum v. 27 (no. 1358); ref. 2528] Odowara, Sagami Bay, Japan (from English label [Japanese label states "locality unknown"]). Holotype (unique): CAS-SU 7706. Type catalog: Böhlke 1953:132 [ref. 12291]. •Synonym of Cottus kazika Jordan & Starks 1904 -- (Watanabe 1960:117 [ref. 11959], Okada 1961:696 [ref. 6363], Goto et al. 2014:[9] [ref. 33456]). •Synonym of Rheopresbe kazika (Jordan & Starks 1904) -- (Goto et al. 2019:[7] [ref. 37068]). Current status: Synonym of Rheopresbe kazika (Jordan & Starks 1904). Cottidae. Habitat: freshwater, brackish, marine.

fuscus, Abyssocottus Bogdanov [B. E.] 2013:92, Fig. 1b [Baikalskiy zoologicheskiy zhurnal [Baikal zoological journal, Irkutsk] No. 13 (2013 no. 2); ref. 37118] Holy Nose Peninsula, Lake Baikal, Russia, depth 500-550 meters. Holotype: Field number 294-09-26. Paratypes: (15). Type depository unknown. •Valid as Abyssocottus fuscus Bogdanov 2013. Current status: Valid as Abyssocottus fuscus Bogdanov 2013. Cottidae. Distribution: Lake Baikal, Russia. Habitat: freshwater.

gibbosus, Abyssocottus Berg [L. S.] 1906:908 [Zoologischer Anzeiger v. 30 (no. 26); ref. 265] Lake Baikal, opposite Baikalskoye village, Russia. Holotype (unique): ZIN 13737. Type catalog: Sideleva & Zhidkov 2021:231 [ref. 38705]. •Valid as Asprocottus gibbosus (Berg 1906) -- (Taliev 1955:336 [ref. 4316]). •Valid as Abyssocottus gibbosus Berg 1906 -- (Berg 1949:1157 [ref. 20662], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:155 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2001:60 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 178 [ref. 27815], Bogutskaya & Naseka 2004:194 [ref. 28183], Bogdanov 2013:96 [ref. 37118], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569], Sideleva & Zhidkov 2021:231 [ref. 38705]). Current status: Valid as Abyssocottus gibbosus Berg 1906. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

gigas, Cottus Kner [R.] 1864:186 [Anzeiger der Kaiserlichen Akademie der Wissenschaften, Wien, Mathematisch-Naturwissenschaftliche Classe v. 1 (no. 24); ref. 2637] Cottidae.

girardi, Cottus Robins [C. R.] 1961:306, Figs. 1a, d [Copeia 1961 (no. 3); ref. 9373] Conochocheague Creek, 9.6 miles northeast of Chambersburg on rt. 11, Franklin County, Pennsylvania, U.S.A. Holotype: CUMV 25607. Paratypes: CUMV 1680 (13), 7363 (10), 25605 (1); UMMZ 167174 (4). Additional material: CUMV (15 lots, 16). •Valid as Cottus girardi Robins 1961 -- (Lee et al. 1980:812 [ref. 22416], Page & Burr 1991:246 [ref. 18983], Jenkins & Burkhead 1994:670 [ref. 21581], Stauffer et al. 1995:255 [ref. 23376], Nelson et al. 2004:119 [ref. 27807], Robins 2005:4 [ref. 28230], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:471 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus girardi Robins 1961. Cottidae. Distribution: Eastern U.S.A. Habitat: freshwater.

gobio, Cottus Linnaeus [C.] 1758:265 [Systema Naturae, Ed. X v. 1; ref. 2787] Stream Freudenbach at Lockstädt, 53°12'N, 12°01'E, Lower Elbe River drainage, Germany. Neotype: NRM 51803. Neotype designated by Fricke 1999:38 [ref. 24101], but withdrawn in Fricke 2000:639 [ref. 24537]. For a discussion of the types and neotype designation see Freyhof et al. 2005:129 [ref. 28259]. •Valid as Cottus gobio Linnaeus 1758 -- (Berg 1949:1145 [ref. 20662], Neelov 1973:593 [ref. 7219], Sideleva 1982:81 [ref. 14469], Fedorov in Whitehead et al. 1986:1247 [ref. 13677], Lelek 1987:274 [ref. 22962], Mitrofanov & Dukravec 1989:281 [ref. 37748], Mrakovcic et al. 1995:184 [ref. 23079], Chereshnev 1996:606 [ref. 24659], Kottelat 1997:169 [ref. 22952], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595], Fricke 1999:38 [ref. 24101], Bogutskaya et al. 2001:46 [ref. 26178], Parin et al. 2002:S73 [ref. 28300], Hanel 2003:61 [ref. 27894], Bogutskaya & Naseka 2004:186 [ref. 28183], Freyhof et al. 2005:124 [ref. 28259], Hanel & Lusk 2005:337 [ref. 28804], Fricke 2007:26 [ref. 30577], Shedko & Miroshnichenko 2007:24 [ref. 29369], Kottelat & Freyhof 2007:508 [ref. 29996], Sideleva 2009:210 [ref. 30173], Bianco 2013:10 [ref. 32897], Goto et al. 2014:[10] [ref. 33456], Parin et al. 2014:243 [ref. 33547], Sideleva et al. 2015:430 [ref. 33770], Sideleva et al. 2018:8 [ref. 36393], Ćaleta et al. 2019:186 [ref. 37026], Lorenzoni et al. 2019:253 [ref. 37108], Dyldin et al. 2020:106 [ref. 37569], Bravničar et al. 2021: [2] 429 [ref. 38624]). Current status: Valid as Cottus gobio Linnaeus 1758. Cottidae. Distribution: Europe. Habitat: freshwater, brackish.

gobioides, Cottus Girard [C. F.] 1850:411 [Proceedings of AAAS (The American Association for the Advancement of Science) 2nd meeting, 1849; ref. 18123] Burlington, Vermont, U.S.A. See also Girard 1850:189 [ref. 1814] and Girard 1851:55, Pl. 2 (figs. 3-4) [ref. 18124]. •Synonym of Cottus cognatus Richardson 1836. Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

godlewskii, Cottus Dybowski [B. N.] 1874:385, Pl. 4 (fig. 2) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal, Russia, depth 100-300 meters. Syntypes: not found at ZIN. •Valid as Abyssocottus godlewskii (Dybowski 1874) -- (Taliev 1955:351 [ref. 4316]). •Valid as Limnocottus godlewskii (Dybowski 1874) -- (Berg 1949:1160 [ref. 20662], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:157 [ref. 23595], Sideleva 2001:68 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 194 [ref. 27815], Bogutskaya & Naseka 2004:198 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2017:47 [ref. 37119], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Limnocottus godlewskii (Dybowski 1874). Cottidae. Distribution: North Asia: southern and central parts of Lake Baikal (Russia). Habitat: freshwater.

gotoi, Procottus Sideleva [V. G.] 2001:69, Fig. 2 [Proceedings of the Zoological Institute, Academy of Sciences, St.-Petersburg No. 287; ref. 26181] Lake Baikal, near Bolshiye Koty Village, depth 10 meters. Holotype: ZIN 52803. Paratypes: ZIN 52084-85 (1, 2). •Valid as Procottus gotoi Sideleva 2001 -- (Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2003:19, 204 [ref. 27815], Bogutskaya & Naseka 2004:200 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Procottus gotoi Sideleva 2001. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

gracilis, Cottus Heckel [J. J.] 1837:148 [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] New York, U.S.A. Holotype (unique): NMW 6422. •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186], Scott & Crossman 1998:835 [ref. 24570], Scharpf 2008:9 [ref. 30399]). •Synonym of Cottus cognatus Richardson 1837, but a valid subspecies -- (Chereshnev 1996:606 [ref. 24659], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

gratzianowi, Cottus Sideleva [V. G.], Naseka [A. M.] & Zhidkov [Z. V.] 2015:420, Figs. 2-3, 5a-6a [Zootaxa 3949 (no. 3); ref. 33770] Ukhtomitsa River village of Korotetskaya (Vologda Province), 60°18′19″N, 38°40′30″E, Onega River drainage, White Sea basin, Arctic basin. Holotype: ZIN 55596. Paratypes: ZIN 55597. •Valid as Cottus gratzianowi Sideleva, Naseka & Zhidkov 2015 -- (Dyldin et al. 2020:110 [ref. 37569], Dyldin et al. 2020:114 [ref. 37569]). Current status: Valid as Cottus gratzianowi Sideleva, Naseka & Zhidkov 2015. Cottidae. Distribution: Northeastern Europe: Onega River drainage, White Sea basin, Arctic basin (Russia). Habitat: freshwater.

greenei, Uranidea Gilbert [C. H.] & Culver [G. B.] in Jordan & Evermann 1898:1965 [Bulletin of the United States National Museum No. 47; ref. 2444] Thousand Springs, Snake River, near mouth of Salmon Fall River, Gooding County, Idaho, U.S.A. Holotype: CAS-SU uncat. Paratypes: CAS-SU uncat. (incl. the type, marked drawn). Type series found by D. Neely 1/2008 at CAS. •Valid as Cottus greenei (Gilbert & Culver 1898) -- (Lee et al. 1980:813 [ref. 22416], Page & Burr 1991:248 [ref. 18983], Fuller et al. 1999:341 [ref. 25838], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:473 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus greenei (Gilbert & Culver 1898). Cottidae. Distribution: Snake River basin, Idaho,U.S.A. Habitat: freshwater.

grewingkii, Cottus Dybowski [B. N.] 1874:384, Pl. 1 (fig. 1) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal, Russia. Lectotype (?): BMNH 1897.7.5.4 [ex ZIN]. Paralectotypes: ZMB 7808 (8). Type catalog: Paepke & Fricke 1992:285 [ref. 19946]. Lectotype selected by Dybowski 1908:559 [ref. 17422]. •Valid as Cottocomephorus grewingkii [sometimes as gerwingki or grewingki] (Dybowski 1874) -- (Berg 1949:1171 [ref. 20662], Taliev 1955:275 [ref. 4316], Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:150 [ref. 23595], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:15, 163 [ref. 27815], Bogutskaya & Naseka 2004:192 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2019:231 [ref. 36814], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Cottocomephorus grewingkii (Dybowski 1874). Cottidae. Distribution: North Asia: Lake Baikal, but mainly central and southern parts (Russia). Habitat: freshwater.

griseus, Abyssocottus godlewskii Taliev [D. N.] 1955:355, Figs. 20, 150-151 [ ref. 4316] Lake Baikal, Russia, depth 16-180 to 700 meters. Syntypes: none found at ZIN. Appeared without distinguishing features and not available in Taliev 1948:113 [ref. 19628]. Neotype [ZIN 50804] apparently designated by Sideleva but not in conformance with the fourth edition of the Code. •Valid as Limnocottus griseus (Taliev 1955) -- (Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702] dating to 1948, Sideleva 1998:157 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178] dating to 1948, Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 197 [ref. 27815] dated to 1948, Bogutskaya & Naseka 2004:199 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2017:47 [ref. 37119], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Limnocottus griseus (Taliev 1955). Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

gruvintii, Centridermichthys Sauvage [H.-E.] (ex Dybowski) 1878:146 [Nouvelles Archives du Muséum d'Histoire Naturelle, Paris (Série 2) v. 1; ref. 3880] Lake Baikal, Russia. Apparently a misspelling of Cottus grewingkii Dybowsky 1874. Misspelling. Current status: Synonym of Cottocomephorus grewingkii (Dybowski 1874). Cottidae. Distribution: Lake Baikal, Russia.

gulosus, Cottopsis Girard [C. F.] 1854:129 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 7; ref. 1817] San Joaquin River, California, U.S.A. Syntypes: USNM 291 (2). •Valid as Cottus gulosus (Girard 1854) -- (Lee et al. 1980:814 [ref. 22416], Page & Burr 1991:252 [ref. 18983], Mecklenburg et al. 2002:404 [ref. 25968], Moyle 2002:350 [ref. 26449], Wydoski & Whitney 2003:210 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:9 [ref. 30399], Page & Burr 2011:481 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus gulosus (Girard 1854). Cottidae. Distribution: Western U.S.A.: Washington, Oregon and California. Habitat: freshwater.

gurwicii, Metacottus Taliev [D. N.] 1946:90, Figs. 1-5 [Doklady Akademii Nauk SSSR, Ser. A (Comptes Rendus de l'Académie des Sciences de l'URSS), Leningrad v. 54 (no. 1); ref. 4315] Lake Baikal at Maritui station, Russia, depth 93 meters. Holotype (unique): ZIN 46660. Sideleva 2001:69 [ref. 26181] and 2003:205 [ref. 27815] regards the holotype as the neotype which does not conform to the code. •Valid as Metacottus gurwicii Taliev 1946 -- (Berg 1949:1170 [ref. 20662], Taliev 1955:300 [ref. 4316]). •Valid as Procottus gurwicii (Taliev 1946) -- (Sideleva 1982:31 [ref. 14469] as gurwici, Reshetnikov et al. 1997:761 [ref. 24702], Sideleva 1998:158 [ref. 23595] as gurwici, Sideleva 2001:72 [ref. 26181] as gurwici, Bogutskaya et al. 2001:47 [ref. 26178] as gurwici, Sideleva 2003:19, 206 [ref. 27815] as gurwici, Bogutskaya & Naseka 2004:200 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Procottus gurwicii (Taliev 1946). Cottidae. Distribution: North Asia: southern part of Lake Baikal (Russia). Habitat: freshwater.

gussinensis, Paracottus kessleri Tarkhova [Yu. N.] 1962:108 [Kratkiie soobscenjia Burjatskij Kompleksnogo Naucno-Issledovatel'skogo Instituta, Akademija Nauk SSR, Sibirskoe Otdelenie, Burjatskij Kompleksnyi Nauno-Issledovatel'skij Institut. No. 3; ref. 22756] Gusinor Lake, Lake Baikal Basin, Russia. Lectotype: ZIN 52232. Paralectotypes: ZIN 52233 (1). Lectotype selected by Sideleva 2003:152 [ref. 27815]. •Synonym of Cottus kesslerii Dybowski 1874, but a valid subspecies -- (Sideleva 1982 [ref. 14469], Sideleva 1998:152 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874), but a valid subspecies gussinensis (Tarkhova 1962) as described -- (Sideleva 2001:60 [ref. 26181], Sideleva 2003:152 [ref. 27815] with author as Tarkhova). •Synonym of Leiocottus kesslerii (Dybowski 1874) -- (Kottelat 2006:61 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

haemusi, Cottus gobio Marinov [B. T.] & Dikov [C. I.] 1986:19 [Acta Zoologica Bulgarica v. 31; ref. 8968] Upper Beli Vit River, above village Ribarica, Danube River basin, Bulgaria. Holotype: DHISUB 6039-1. Paratypes: DHISUB 6016-1 to 6038-1 (23), 6040-1 to 6045-1 (6). •Tentatively a synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952]). •Synonym of Cottus gobio Linnaeus 1758, but a valid subspecies as described -- (Vassilev & Pehlivanov 2005:184 [ref. 28369]). •Valid as Cottus haemusi Marinov & Dikov 1986 -- (Freyhof et al. 2005:160 [ref. 28259], Kottelat & Freyhof 2007:510 [ref. 29996] Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus haemusi Marinov & Dikov 1986. Cottidae. Distribution: Bulgaria. Habitat: freshwater, brackish.

haitej, Cottus Dybowski [B. N.] 1869:949, Pl. 14 (fig. 2) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 19; ref. 1169] Onon and Ingoda rivers and their tributaries, Russia. Syntypes: (2) ?BMNH 1871.7.19.9 (1), ZMB 7106 (1). Type catalog: Paepke & Fricke 1992:282 [ref. 19946]. Original as haïtej, correction to haitej required. •Valid as Mesocottus haitej (Dybowski 1869) -- (Berg 1949:1138 [ref. 20662], Sideleva 1982:82 [ref. 14469], Zhu 1995:188 [ref. 25213], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:153 [ref. 23595], Pietsch et al. 2001:145 [ref. 25688], Bogutskaya et al. 2001:46 [ref. 26178], Parin et al. 2002:S80 [ref. 28300], Bogutskaya & Naseka 2004:190 [ref. 28183], Kottelat 2006:61 [ref. 28831], Ocock et al. 2006:58 [ref. 28933], Bogutskaya et al. 2008:352 [ref. 30085], Goto et al. 2014:[6] [ref. 33456], Parin et al. 2014:259 [ref. 33547], Zhang et al. 2016:194 [ref. 34477], Dyldin & Orlov 2017:65 [ref. 35138], Dyldin et al. 2021:65 [ref. 38804]). Current status: Valid as Mesocottus haitej (Dybowski 1869). Cottidae. Distribution: East Asia: China, Mongolia and Russia. Habitat: freshwater, brackish.

hangiongensis, Cottus Mori [T.] 1930:48 [10], Fig. [Journal of the Chosen Natural History Society No. 11; ref. 16505] Kai-nei, Korea. Holotype: whereabouts unknown. Additional specimens: (3). On p. 10 of separate. •Valid as Cottus hangiongensis Mori 1930 -- (Watanabe 1960:126 [ref. 11959], Okada 1961:704 [ref. 6363], Yabe in Masuda et al. 1984:326 [ref. 6441], Kawanabe & Mizuno 1989:658 [ref. 25598], Kim & Youn 1992:60 [ref. 22287], Zhu 1995:189 [ref. 25213], Kim 1997:404 [ref. 24032], Nakabo 2000:638 [ref. 25086], Matsuura et al. 2000:202 [ref. 26000], Pietsch et al. 2001:144 [ref. 25688], Bogutskaya et al. 2001:46 [ref. 26178], Kim & Park 2002:325 [ref. 25913], Nakabo 2002:638 [ref. 26001], Choi et al. 2003:262, 572 [ref. 26218], Hagiwara 2003:37 [ref. 27188], Bogutskaya & Naseka 2004:187 [ref. 28183], Fujii et al. 2005:12 [ref. 28191], Sideleva & Goto 2009:600 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:243 [ref. 33547], Zhang et al. 2016:193 [ref. 34477], Dyldin & Orlov 2017:63 [ref. 35138], Dyldin et al. 2021:62 [ref. 38804] with question). Current status: Valid as Cottus hangiongensis Mori 1930. Cottidae. Distribution: Northwestern Pacific. Habitat: freshwater, brackish, marine.

herzensteini, Asprocottus Berg [L. S.] 1906:907 [Zoologischer Anzeiger v. 30 (no. 26); ref. 265] Lake Baikal, Russia, depth 45-1800 meters. Holotype: ZIN 13760. Type catalog: Sideleva & Zhidkov 2021:233 [ref. 38705]. Sideleva 2001:61 [ref. 26181] recognizes a holotype. •Valid as Asprocottus herzensteini Berg 1906 -- (Berg 1949:1167 [ref. 20662], Taliev 1955:316 [ref. 4316], Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:155 [ref. 23595], Sideleva 2001:61 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 180 [ref. 27815], Bogutskaya & Naseka 2004:195 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:118 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569], Sideleva & Zhidkov 2021:233 [ref. 38705]). Current status: Valid as Asprocottus herzensteini Berg 1906. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

hilgendorfii, Cottus Döderlein [L.] in Steindachner & Döderlein 1884:208 [40] [Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 49 (1. Abth.); ref. 4248] Tokyo, Japan. Holotype (unique): NMW. See also Watanabe 1960:121 [ref. 11959]. Both Watanabe and Okada described a new species Cottus japonicus but with hilgendorfii in synonymy [as hilgendorfi]. •Synonym of Cottus japonicus Okada 1961 -- (Okada 1961:699 [ref. 6363]). •Synonym of Cottus pollux Günther 1873 -- (Okada 1961:699 [ref. 6363], Zhang et al. 2016:193 [ref. 34477] with authorship as Steindachner & Doderlein). Current status: Synonym of Cottus pollux Günther 1873. Cottidae. Habitat: freshwater.

hispaniolensis, Cottus gobio Bǎcescu [M. C.] & Bǎcescu-Meşter [L.] 1964:444 [Vie et Milieu Suppl. No. 17; ref. 1238] Garona River at Viella, eastern Pyreneans, Spain. Syntypes: ?MGAB. •Synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952]). •Valid as Cottus hispaniolensis Bǎcescu & Bǎcescu-Meşter 1964 -- (Freyhof et al. 2005:134 [ref. 28259], Kottelat & Freyhof 2007:511 [ref. 29996], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus hispaniolensis Bǎcescu & Bǎcescu-Meşter 1964. Cottidae. Distribution: Garonne drainage, Spain and France. Habitat: freshwater.

hoyi, Uranidea Putnam [F. W.] in Nelson 1876:41 [Bulletin of the Illinois Museum of Natural History v. 1 (no. 1); ref. 3154] Lake Michigan, 12 miles off Racine, Wisconsin, U.S.A., depth 42 fathoms. Holotype (unique): USNM 30903. •Synonym of Cottus cognatus Richardson 1836. Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

hubbsi, Cottus Bailey [R. M.] & Dimick [M. F.] 1949:2, Pl. 1 [Occasional Papers of the Museum of Zoology University of Michigan No. 513; ref. 12998] Entiat River, Chelan County, Washington, U.S.A. Holotype: UMMZ 145161. Paratypes: UMMZ 98675 (2), 98802 (2), 129736 (3), 145160 (2), 145162 (2); USNM 142967-70 (2, 1, 2, 2). •Synonym of Cottus bairdii Girard 1850 -- (Bailey & Bond 1963:1 [ref. 3934], Scott & Crossman 1998:830 [ref. 24570] as bairdi). •Valid as Cottus hubbsi Bailey & Dimick 1949 -- (Markle & Hill 2000:202 [ref. 24886], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:475 [ref. 31199], Scharpf 2008:10 [ref. 30399], Page & Burr 2011:478 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus hubbsi Bailey & Dimick 1949. Cottidae. Distribution: Southwestern Canada and northwestern U.S.A. Habitat: freshwater.

hypselurus, Cottus Robins [C. R.] & Robison [H. W.] 1985:361, Figs. 1-2 [American Midland Naturalist v. 114 (no. 2); ref. 17268] Bennett Springs, 11 miles northwest of Lebanon, Missouri, U.S.A. Holotype: UMMZ 150419. Paratypes: CUMV 23478 (26), 37382 (25). Additional material: ANSP 67275-77 (3); CUMV (5 lots, 143); KU (4 lots, 99); NLU (8 lots, 242; now 6 lots); SAU uncat (5 lots, 99); UMMZ (19 lots, 268); USNM 93272 (7). •Valid as Cottus hypselurus Robins & Robison 1985 -- (Robison & Buchanan 1988:477 [ref. 23393], Page & Burr 1991:250 [ref. 18983], Kinziger et al. 2000:1007 [ref. 25019], Gasper et al. 2001:264 [ref. 25578], Kinziger & Wood 2003:624 [ref. 27132] and also recognized a Cottus sp. cf. cypselurus, Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:10 [ref. 30399], Kinziger & Wood 2010:58 [ref. 30701], Page & Burr 2011:478 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus hypselurus Robins & Robison 1985. Cottidae. Distribution: Missouri and Arkansas, U.S.A. Habitat: freshwater.

ictalops, Pegedictis Rafinesque [C. S.] 1820:85 [Ichthyologia Ohiensis; ref. 3592] Near Lexington, Kentucky, U.S.A. No types known. •Synonym of Cottus bairdii Girard 1850 -- (Smith 1986:356 [ref. 22186] as bairdi). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

immaculatus, Cottus Kinziger [A. P.] & Wood [R. M.] 2010:51, Figs. 1, 2B, 3 [Zootaxa No. 2340; ref. 30701] Current River at Baptist Camp Access, 2.7 air kilometers east of Montauk State Park, 37°26.111'N, 91°39.447'W, Dent County, Missouri, U.S.A. Holotype: USNM 369996. Paratypes: INHS 102783 (10), USNM 396997 (10), UW 118923 (5). Plus non-type specimens. •Valid as Cottus immaculatus Kinziger & Wood 2010 -- (Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus immaculatus Kinziger & Wood 2010. Cottidae. Distribution: Arkansas and Missouri, U.S.A. Habitat: freshwater.

inermis, Acanthocottus Ayres [W. O.] 1854:170 [The Pacific [newspaper] v. 3 and 4 (thru no. 6); ref. 157] San Francisco Bay, California, U.S.A. No types known. Originally as Acanthocottus (?) inermis. Appeared first as above on 1 Sept. •Synonym of Leptocottus armatus Girard 1854. Current status: Synonym of Leptocottus armatus Girard 1854. Cottidae. Habitat: brackish, marine.

inermis, Cottus Yakovlev [V. E.] 1890:52 [4] [Izvestiia Vostochno-Sibirskogo otdiela Imperatorskago geograficheskago obshchestva. v. 21 (no. 3); ref. 19625] Irkut River, tributary of Angara River, Lake Baikal, Russia (Angara River near Irkutsk). Neotype: ZIN 6350. On p. 4 of separate. Sideleva 2001:58 [ref. 26181] names a neotype [ZIN 6350], but if that is the first time a neotype was named it is unavailable under the Code. Neotype designated by Sideleva 2003:166 [ref. 27815]. •Synonym of Cottocomephorus grewingkii (Dybowski 1874) -- (Berg 1949:1171 [ref. 20662]). •Valid as Cottocomephorus inermis (Yakovlev 1890) -- (Taliev 1955:292 [ref. 4316], Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:150 [ref. 23595], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:16, 166 [ref. 27815], Bogutskaya & Naseka 2004:192 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2019:230 [ref. 36814], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Cottocomephorus inermis (Yakovlev 1890). Cottidae. Distribution: North Asia: Lake Baikal and Angara River (Russia). Habitat: freshwater.

infernatis, Cottus carolinae Williams [J. D.] & Robins [C. R.] 1970:371, Fig. 1 [American Midland Naturalist v. 83 (no. 2); ref. 7791] Chewacla Creek, Chewacla State Park, about 3 miles south of Auburn, Lower Alabama river system, Lee County, Alabama, U.S.A. Holotype: USNM 203762. Paratypes: CUMV 53321 (4); TU 32497 (5); UAIC 1237 (4), 2118 (3); UMMZ 111208 (5); USNM 20078 (4), 203336-39 (1, 1, 1, 1). Type catalog: Bart & Taylor 1993:66-67 [ref. 20906]. •Synonym of Cottus carolinae (Gill 1861) -- (Lee et al. 1980:807 [ref. 22416], Robison & Buchanan 1988:476 [ref. 23393]). •Synonym of Cottus carolinae (Gill 1861), but a valid subspecies as described -- (Boschung & Mayden 2004:423 [ref. 27995] as infernatus, Neely et al. 2007:651 [ref. 29262] as inferenatus, Scharpf 2008:8 [ref. 30399], Page & Burr 2011:470 [ref. 31215]). Current status: Synonym of Cottus carolinae (Gill 1861). Cottidae. Distribution: Alabama, U.S.A. [subspecies infernatis]. Habitat: freshwater.

insularis, Paracottus Taliev [D. N.] 1955:42 et seq., 241, Figs. 2 et seq., Fig. 92 [ ref. 4316] Lake Baikal, Russia. Syntypes: none found at ZIN. Appeared as Cottus insularis in Taliev 1948:113 [ref. 19628] without distinguishing features. As Paracottus (Paracottus) insularis on p. 235 and 241. •Synonym of Paracottus knerii (Dybowski 1874) -- (Sideleva 1982:28 [ref. 14469], Sideleva 1998:153 [ref. 23595], Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 168 [ref. 27815]). Current status: Synonym of Paracottus knerii (Dybowski 1874). Cottidae. Habitat: freshwater.

intermedius, Asprocottus herzensteini Taliev [D. N.] 1955:319, Figs. 132-133 [ ref. 4316] Lake Baikal, Russia. Syntypes: no types found at ZIN. Appeared without distinguishing features and not available in Taliev 1948:113 [ref. 19628] as Asprocottus intermedius. •Valid as Asprocottus intermedius Taliev 1955 -- (Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702] dating to 1948, Sideleva 1998:156 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Bogutskaya & Naseka 2004:195 [ref. 28183], Bogdanov 2018:118 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus intermedius Taliev 1955. Cottidae. Distribution: North Asia: Lake Baikal, but mainly in northern part (Russia). Habitat: freshwater.

japonicus, Centridermichthys Steindachner [F.] 1881:187 [9], Pl. 7 (figs. 1, 1a) [Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 83 (1. Abth.); ref. 4231] Kanagava, Japan. On p. 9 of separate. Apparently described independently of Centridermichthys japonicus Steindachner 1870. Objectively invalid; preoccupied by Centridermichthys japonicus Steindachner 1870. 1°Homonym. Cottidae. Habitat: freshwater.

japonicus, Cottus Watanabe [M.] 1960:121, Pl. 7 (fig. 1) [Fauna Japonica: Cottidae (Pisces); ref. 11959] Hei River, Miyako, & Koshi River, Kamaishi-gun, Iwate Prefecture; and Haguro River, Kitamurayama-gun, Yamagata Prefecture, Japan. Syntypes: (51). See also Cottus japonicus Okada 1961. •Objectively invalid; preoccupied by Cottus japonicus Pallas 1769. •Status uncertain. 1°Homonym. Current status: Synonym of Cottus. Cottidae. Habitat: freshwater.

japonicus, Cottus Okada [Y.] 1961:699, Figs. 121 a-e [Studies on the freshwater fishes of Japan.; ref. 6363] Japan. Syntypes: whereabouts unknown. Objectively invalid; preoccupied by Cottus japonicus Pal/las 1769 and Cottus japonicus Watanabe 1960. Clearly described as a new species, but perhaps intended to be the same as Cottus japonicus Watanabe 1960 with same common name "Kajika" and based on same sources. Okada's work was apparently to predate Watanabe's work, but Okada dates to 1961 and Watanabe to 1960; perhaps last minute changes resulted in the description of two new species. •Objectively invalid; preoccupied by Cottus japonicus Pallas 1769. •Status uncertain. 1°Homonym. Current status: Synonym of Cottus. Cottidae. Habitat: freshwater.

jaxartensis, Cottus gobio Berg [L. S.] 1916:437 [Les Poissons des eaux douces de la Russie; ref. 277] Ugam River, tributary of Chirchik River, Syr-Darya basin, Uzbekistan. Holotype (unique): ZIN 7799. Type catalog: Sideleva & Zhidkov 2021:239 [ref. 38705]. •Synonym of Cottus gobio Linnaeus 1758, but a valid subspecies as described -- (Berg 1949:1148 [ref. 20662]). •Tentatively a synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952]). •Valid as Cottus jaxartensis Berg 1916 -- (Mitrofanov & Dukravec 1989:282 [ref. 37748], Sideleva 2021:255 [ref. 38323], Sideleva & Zhidkov 2021:239 [ref. 38705]). Current status: Valid as Cottus jaxartensis Berg 1916. Cottidae. Distribution: Central Asia: Syr-Darya basin, Uzbekistan, Kazakhstan and Kyrgyzstan. Habitat: freshwater, brackish.

jeittelesii, Cottus Dybowski [B. N.] 1874:386, Pl. 3 (fig. 1) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal, Russia. Lectotype: ZIN 3240. Paralectotypes: ? ZMB 7946 (1). Type catalog: Paepke & Fricke 1992:285 [ref. 19946]. Lectotype selected by Sideleva 2003:203 [ref. 27815]. •Valid as Procottus jeittelesii (Dybowski 1874) -- (Berg 1949:1168 [ref. 20662], Taliev 1955:302 [ref. 4316], Sideleva 1982:31 [ref. 14469] as jeittelesi, Reshetnikov et al. 1997:761 [ref. 24702], Sideleva 1998:158 [ref. 23595], Sideleva 2001:69 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:19, 203 [ref. 27815], Bogutskaya & Naseka 2004:200 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Procottus jeittelesii (Dybowski 1874). Cottidae. Distribution: North Asia: Lake Baikal, but mainly in central and southern parts (Russia). Habitat: freshwater.

kaganowskii, Cottus Berg [L. S.] 1932:17, Figs. 1-2 [Copeia 1932 (no. 1); ref. 16356] Belaya River to the mouth, Anadyr River system, northeastern Siberia, Russia. Syntypes: ZIN 23140-41 (1, 1), 23805-09 (23, 20, 2, 1, 1). Type catalog: Sideleva & Zhidkov 2021:236 [ref. 38705]. •Valid as Cottus kaganowskii Berg 1932 -- (Berg 1949:1152 [ref. 20662]). •Synonym of Cottus cognatus Richardson 1836 -- (Lee et al. 1980:808 [ref. 22416], Sideleva 1998:151 [ref. 23595], Sheiko & Fedorov 2000:27 [ref. 25650], Parin et al. 2002:S73 [ref. 28300], Sideleva & Zhidkov 2021:237 [ref. 38705]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

kanawhae, Cottus Robins [C. R.] 2005:1, Fig. 1 [Zootaxa No. 987; ref. 28230] Creek in Tony's Cave, tributary of Sinking Creek, Giles County, Virginia, U.S.A. Holotype: CUMV 25655. Paratypes: CUMV 12453 (19), 21946 (5), 22085 (2), 22087 (2), 22832 (13), 22833 (31), 22835 (1), 22840 (11), 24397 (1); USNM 162191 (6). Plus non-type material. •Valid as Cottus kanawhae Robins 2005 -- (Scharpf 2008:10 [ref. 30399], Page & Burr 2011:470 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus kanawhae Robins 2005. Cottidae. Distribution: New River system, Virginia and West Virginia, U.S.A. Habitat: freshwater.

kazika, Cottus Jordan [D. S.] & Starks [E. C.] 1904:265, Fig. 15 [Proceedings of the United States National Museum v. 27 (no. 1358); ref. 2528] Niigata, Japan. Holotype: CAS-SU 7705. Paratypes: USNM 50918 (1), 57795 (2). Non-types: ?BMNH 1905.2.4.397 (1), CAS-SU 7578 (5). Type catalog: Böhlke 1953:128 [ref. 12291]. The species name was spelled kazika in three places, but in the derivation it is stated, "(kajika, the Japanese name of river sculpins.)". •Valid as Cottus kazika Jordan & Starks 1904 -- (Watanabe 1960:117 [ref. 11959] as kajika, Okada 1961:696 [ref. 6363], Yabe in Masuda et al. 1984:326 [ref. 6441], Kawanabe & Mizuno 1989:655 [ref. 25598], Takahashi et al. 1997:45 [ref. 24971], Sato et al. 1998:39 [ref. 24972], Nakabo 2000:637 [ref. 25086], Matsuura et al. 2000:203 [ref. 26000], Nakabo 2002:637 [ref. 26001], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456]). •Valid as Rheopresbe kazika (Jordan & Starks 1904) -- (Goto et al. 2019:[7] [ref. 37068]). Current status: Valid as Rheopresbe kazika (Jordan & Starks 1904). Cottidae. Distribution: Rivers from Aomori Prefecture to the western part of Yamaguchi Prefecture, Sea of Japan, Ibaraki Prefecture to the eastern part of Yamaguchi Prefecture, Pacific, and Shikoku Island and northern part of Kyushu Island, Japan. Habitat: freshwater, brackish, marine.

kesslerii, Cottus Dybowski [B. N.] 1874:384, Pl. 2 (fig. 1) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal; Angara, Irkut and Selenga rivers, Siberia, Russia. Syntypes: BMNH 1897.7.5.5 (1), ZMB 7807 (4). Type catalog: Paepke & Fricke 1992:283 [ref. 19946]. •Valid as Paracottus kessleri (Dybowski 1874) -- (Taliev 1955:243 [ref. 4316]). •Valid as Cottus kesslerii Dybowski 1874 -- (Berg 1949:1153 [ref. 20662] as kessleri, Sideleva 1982:27 [ref. 14469] as kessleri, Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595]). •Valid as Leocottus kesslerii (Dybowski 1874) -- (Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:59 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:16, 151 [ref. 27815], Bogutskaya & Naseka 2004:189 [ref. 28183], Kottelat 2006:60 [ref. 28831], Ocock et al. 2006:58 [ref. 28933], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2015:386 [454] [ref. 37122]). Current status: Valid as Leocottus kesslerii (Dybowski 1874). Cottidae. Distribution: North Asia: Lake Baikal and tributaries (Russia and Mongolia). Habitat: freshwater.

klamathensis, Cottus Gilbert [C. H.] 1898:10, Fig. [Bulletin of the U. S. Fish Commission v. 17 (art. 1) [1897]; ref. 12349] Upper Klamath Lake near Klamath Falls, Klamath County, Oregon, U.S.A. Holotype: USNM 48226. Paratypes: (20) ANSP 39138 (1), 39143 (1); BMNH 1900.9.29.195-196 (2); ?CAS-SU 6290 (63); ?UMMZ 130637 (19). Type catalog: Böhlke 1953:128 [ref. 12291], Böhlke 1984:65 [ref. 13621]. •Valid as Cottus klamathensis subspecies klamathensis Gilbert 1898 -- (Miller & Taylor 1984:938 [ref. 6809], Moyle 2002:356 [ref. 26449]). •Valid as Cottus klamathensis Gilbert 1898 -- (Lee et al. 1980:815 [ref. 22416], Daniels & Moyle 1984:954 [ref. 8977], Page & Burr 1991:253 [ref. 18983], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:10 [ref. 30399] with subspecies, Page & Burr 2011:482 [ref. 31215] with 3 subspecies, Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus klamathensis Gilbert 1898. Cottidae. Distribution: Western U.S.A.: Oregon and California. Klamath River above Kalamath Falls [subspecies klamathensis]. Habitat: freshwater.

knerii, Cottus Dybowski [B. N.] 1874:385, Pl. 2 (fig. 2) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 24 (no. 3-4); ref. 1172] Lake Baikal; Angara, Irkut, Selenga rivers, Siberia, Russia. Syntypes: ZMB 7809 (1), 7947 (2). Type catalog: Paepke & Fricke 1992:283 [ref. 19946]. •Valid as Cottus knerii Dybowski 1874 -- (Berg 1949:1151 [ref. 20662] as kneri). •Valid as Paracottus knerii (Dybowski 1874) -- (Taliev 1955:236 [ref. 4316], Sideleva 1982:28 [ref. 14469], Chereshnev 1996:606 [ref. 24659] as kneri, Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:153 [ref. 23595], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:16, 168 [ref. 27815], Bogutskaya & Naseka 2004:193 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Paracottus knerii (Dybowski 1874). Cottidae. Distribution: North Asia: Lake Baikal and tributaries (Russia). Habitat: freshwater.

kolymensis, Cottus Sideleva [V. G.] & Goto [A.] 2012:289 [302], figs. 1-2 [Voprosy Ikhtiologii v. 52; ref. 32050] Dukcha River, near the city of Magadan, Russia. Holotype: ZISP 53969. Paratypes: ZISP 10073 (3), 10407 (10), 14300 (2), 24110 (15), 24895 (11), 24896 (1), 24897 (1), 24898 (2), 24899 (1), 24900 (1), 24901 (1), 24902 (1), 54459b (5). •Valid as Cottus kolymensis Sideleva & Goto 2012 -- (Parin et al. 2014:241 [ref. 33547], Parin et al. 2014:243 [ref. 33547], Dyldin et al. 2020:109, 114 [ref. 37569]). Current status: Valid as Cottus kolymensis Sideleva & Goto 2012. Cottidae. Distribution: East Asia: Kolyma, Dukcha nnd Magadan rivers, Okhotsk Sea watersheds (Russia). Habitat: freshwater.

koreanus, Cottus Fujii [R.], Choi [Y.] & Yabe [M.] 2005:8, Figs. 1-3 [Species Diversity v. 10 (no. 1); ref. 28191] Stream at Mt. Chiak, Namhan River system, Hackkok-ri, Socho-myon, Wonju-gun, Kangwon-do, Korea. Holotype: HUMZ 155725. Paratypes: CNUC 25009-10 (2); HUMZ 155722 (1), 155726-39 (14), 155764 (1); NSMT-P 60690-91 (2). Plus non-type material. •Valid as Cottus koreanus Fujii, Choi & Yabe 2005 -- (Sideleva & Goto 2009:607 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241 [ref. 33547]). Current status: Valid as Cottus koreanus Fujii, Choi & Yabe 2005. Cottidae. Distribution: Korea. Habitat: freshwater.

korjakovi, Asprocottus Sideleva [V. G.] 2001:61, Fig. 1 [Proceedings of the Zoological Institute, Academy of Sciences, St.-Petersburg No. 287; ref. 26181] Lake Baikal, Maloye Morye Strait, Zunduk Cape, Russia, depth 115-125 meters. Holotype: ZIN 50871. Paratypes: ZIN 52086 (1). •Valid as Asprocottus korjakovi Sideleva 2001, with subspecies -- (Sideleva 2001:61 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 183 [ref. 27815], Bogutskaya & Naseka 2004:195 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:119 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus korjakovi Sideleva 2001. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

korotneffi, Abyssocottus Berg [L. S.] 1906:908 [Zoologischer Anzeiger v. 30 (no. 26); ref. 265] Lake Baikal, Russia, depth 700 feet. Lectotype: ZIN 13733. Paralectotypes: ZIN 13733A (1). Type catalog: Sideleva & Zhidkov 2021:232 [ref. 38705]. Sideleva 2001:61 [ref. 26181] lists a holotype [ZIN 50871], but that is invalid under the code. She designated a lectotype in Sideleva 2003:174 [ref. 27815]. •Valid as Abyssocottus korotneffi Berg 1906 -- (Berg 1949:1157 [ref. 20662], Taliev 1955:348 [ref. 4316], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:155 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2001:61 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17 [ref. 27815], Bogutskaya & Naseka 2004:194 [ref. 28183], Bogdanov 2013:96 [ref. 37118], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569], Sideleva & Zhidkov 2021:232 [ref. 38705]). Current status: Valid as Abyssocottus korotneffi Berg 1906. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

koshewnikowi, Cottus Gratzianov [V. I.] 1907:658 [Zoologischer Anzeiger v. 31 (no. 21/22); ref. 1872] Goredva River, Ligachevo village, Moscow Oblast, Russia. Lectotype: ZMMU P-2688. Paralectotypes: ZMMU P-2001 (4), P-2658 (20), P-2688 (2, now 1), P-3118 (1), P-3121 (3), P-3912 (1). Type catalog: Svetovidova 1978:259 [ref. 9011], Vasil'eva et al. 2001:79-80 [ref. 25714]. Also in Gratsianov 1907:315 [ref. 1871], earliest not researched. Name also seen as Gratsianow. Lectotype designated by Sideleva et al. 2015:33 [ref. 35276]. •Synonym of Cottus gobio Linnaeus 1758, but a valid subspecies koshewnikowi Gratzianov 1907 -- (Berg 1949:1147 [ref. 20662], Lelek 1987:274 [ref. 22962], Mitrofanov & Dukravec 1989:282 [ref. 37748], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:151 [ref. 23595]). •Synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952], Tsvetkov et al. 2001:121 [ref. 26836]). •Valid as Cottus koshewnikowi Gratzianov 1907 -- (Bogutskaya & Naseka 2004:187 [ref. 28183], Freyhof et al. 2005:163 [ref. 28259], Fricke 2007:29 [ref. 30577], Kottelat & Freyhof 2007:511 [ref. 29996], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:429 [ref. 33770], Sideleva et al. 2015:34 [ref. 35276]). Current status: Valid as Cottus koshewnikowi Gratzianov 1907. Cottidae. Distribution: Northern Europe. Habitat: freshwater, brackish.

kozovi, Limnocottus Taliev [D. N.] 1946:737, Fig. 1 [Doklady Akademii Nauk SSSR, Ser. A (Comptes Rendus de l'Académie des Sciences de l'URSS), Leningrad v. 52 (no. 8); ref. 13135] Baunt Lake, east of Lake Baikal, Vitim River basin, Buryatia, Russia [in error for Lake Baikal]. Holotype (unique): ZIN 49713. Sideleva (pers. comm.) indicates that this species does not occur in Baunt Lake. •Valid as Asprocottus kozovi (Taliev 1946) -- (Taliev 1955:339 [ref. 4316]). •Valid as Limnocottus kozovi Taliev 1946 -- (Berg 1949:1164 [ref. 20662]). •Valid as Asprocottus kozovi (Taliev 1946) -- (Taliev 1955:75 [ref. 4316]). •Synonym of Limnocottus megalops (Gratzianov 1902) -- (Sideleva 1998:157 [ref. 23595]). •Synonym of Cyphocottus megalops (Gratzianov 1902) -- (Sideleva 2003:191 [ref. 27815]). Current status: Synonym of Cyphocottus megalops (Gratzianov 1902). Cottidae. Habitat: freshwater.

kumlieni, Uranidea Hoy [P. R.] in Nelson 1876:41 [Bulletin of the Illinois Museum of Natural History v. 1 (no. 1); ref. 3154] Deep water in Lake Michigan, U.S.A. Holotype (unique): USNM 30904. Authorship uncertain from text, perhaps Nelson (ex Hoy), with description from one of Hoy's types. •Synonym of Cottus bairdii Girard 1850 -- (Smith 1986:356 [ref. 22186], Scott & Crossman 1998:826 [ref. 24570] as bairdi). •Synonym of Cottus bairdii Girard 1850, but a valid subspecies -- (Kinziger et al. 2000:1007 [ref. 25019] as bairdi, Scharpf 2008:7 [ref. 30399]). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Distribution: Canada and northern U.S.A. [this subspecies]. Habitat: freshwater.

kuznetzovi, Cottus Berg [L. S.] 1903:110 [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 8; ref. 263] Chuya River, Lena River basin [not Lake Baikal basin], Russia. Neotype: ZIN 53969. Type catalog: Sideleva & Zhidkov 2021:237 [ref. 38705]. Unique holotype [ZIN 12476] lost; neotype selected by Sideleva & Goto 2009:607 [ref. 30591]. •Synonym of Cottus poecilopus Heckel 1837 -- (Berg 1949:1143 [ref. 20662], Fedorov in Whitehead et al. 1986:1248 [ref. 13677], Sideleva 1998:152 [ref. 23595], Freyhof et al. 2005:167 [ref. 28259]). •Valid as Cottus kuznetzovi berg 1903 -- (Sideleva & Goto 2009:607 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241 [ref. 33547], Parin et al. 2014:244 [ref. 33547], Dyldin et al. 2020:114 [ref. 37569], Sideleva & Zhidkov 2021:237 [ref. 38705]). Current status: Valid as Cottus kuznetzovi Berg 1903. Cottidae. Distribution: North Asia: Lena River and its tributaries (Russia). Habitat: freshwater, brackish.

latissimus, Cottus Meuschen [F. C.] 1778:42 [Museum Gronovianum; ref. 17682] Original not seen. Not available, published in a rejected work (Opinion 260). Suppressed. Cottidae.

leiopomus, Cottus Gilbert [C. H.] & Evermann [B. W.] 1894:203, Pl. 20 (fig. 2) [Bulletin of the U. S. Fish Commission v. 14 (art. 16) (for 1894); ref. 12377] Big [not Little] Wood River, Shoshone, Idaho, U.S.A. Holotype: USNM 45389. Paratypes: BMNH 1897.1.12.15 (1), CAS-SU 1178 [not 1151 as published] (1). Type catalog: Böhlke 1953:128 [ref. 12291]. •Valid as Cottus leiopomus Gilbert & Evermann 1894 -- (Lee et al. 1980:816 [ref. 22416], Page & Burr 1991:252 [ref. 18983], Nelson et al. 2004:119 [ref. 27807], Meyer et al. 2008:648 [ref. 29820], Page & Burr 2011:483 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus leiopomus Gilbert & Evermann 1894. Cottidae. Distribution: Snake River system, Idaho, U.S.A. Habitat: freshwater.

lubricus, Paracottus (Leocottus) kessleri Taliev [D. N.] 1955:250, Figs. 97-98 [ ref. 4316] Lake Baikal, Russia. Syntypes: none at ZIN. •Synonym of Cottus kesslerii Dybowski 1874 -- (Sideleva 1982:15 [ref. 14469], Sideleva 1998:151 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 151 [ref. 27815], Kottelat 2006:60 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

macrops, Cottus Rutter [C. L.] 1908:146, Fig. 4 [Bulletin of the Bureau of Fisheries v. 27 (Doc. 637) (for 1907); ref. 12415] Fall River at Dana, California, U.S.A. Lectotype: USNM 58499. Paralectotypes: (18) CAS-SU 24186 (4); USNM 88464 (2), 126424 (4), 265225 (13). Type catalog: Böhlke 1953:128 [ref. 12291]. Lectotype selected by Daniels & Moyle 1984:951 [ref. 8977]. •Status uncertain -- (Lee et al. 1980:815 [ref. 22416]). •Synonym of Cottus klamathensis Gilbert 1898, but a valid subspecies macrops Rutter 1908 -- (Miller & Taylor 1984:957 [ref. 6809], Moyle 2002:356 [ref. 26449], Scharpf 2008:10 [ref. 30399], Page & Burr 2011:483 [ref. 31215]). Current status: Synonym of Cottus klamathensis Gilbert 1898. Cottidae. Distribution: Pit River system, California, U.S.A. [subspecies macrops]. Habitat: freshwater.

macrostomus, Cottus gobio var. Jeitteles [L. H.] 1863:14 [Jahres-Berichte des Olumützer K. K. Gymnasiums für das Schuljahr 1863; ref. 23055] Original not seen. Treated as infrasubspecific by Kottelat 1997:169 [ref. 22952]. Not available; if regarded as available the name is preoccupied by Cottus poecilopus var. macrostomus Jeitteles 1862. From Czech Republic. •In the synonymy of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952], Freyhof et al. 2005:125 [ref. 28259]). Infrasubspecific. Current status: Synonym of Cottus gobio Linnaeus 1758. Cottidae.

macrostomus, Cottus poecilopus var. Jeitteles [L. H.] 1862:292, Pl. 2 (fig. 2) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 12; ref. 21181] Stream near Koritnicza, Liptau, streams near Pohorella near the mountain of Köningsberg and Hámor at Kaschau, Slovakia. Syntypes: whereabouts unknown. •Synonym of Cottus poecilopus Heckel 1837 -- (Kottelat 1997:170 [ref. 22952], Freyhof et al. 2005:167 [ref. 28259]). Current status: Synonym of Cottus poecilopus Heckel 1837. Cottidae. Habitat: freshwater.

major, Procottus jeittelesi Taliev [D. N.] in Berg 1949:1169 [Freshwater fishes of the U.S.S.R. and adjacent countries No. 30; ref. 20662] Lake Baikal, Russia. No types at ZIN. Appeared without distinguishing features and not available in Taliev 1944:34 and Taliev 1948:113 [ref. 19628]. Also appeared in Taliev 1955:309 [ref. 4316] but dates to Taliev in Berg as above. Neotype [ZIN 52082] if designated first by Sideleva 2001:73 [ref. 26181] and 2003:208 [ref. 27815] is invalid. •Synonym of Procottus jeittelesii (Dybowski 1874), but a valid subspecies as described -- (Berg 1949:1169 [ref. 20662], Taliev 1955:309 [ref. 4316]). •Valid as Procottus major Taliev 1949 -- (Sideleva 1982:31 [ref. 14469], Reshetnikov et al. 1997:761 [ref. 24702], Sideleva 1998:158 [ref. 23595], Sideleva 2001:72 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:19, 208 [ref. 27815] dating to Taliev 1944, Bogutskaya & Naseka 2004:200 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Procottus major Taliev 1949. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

marginata, Uranidea Bean [T. H.] 1881:26 [Proceedings of the United States National Museum v. 4 (no. 190); ref. 16046] Tributaries of Walla Walla River, Washington, U.S.A. Syntypes: CAS-SU 1953 (1), USNM 24197 (orig. 9, now 8). Type catalog: Böhlke 1953:133 [ref. 12291]. •Valid as Cottus marginatus (Bean 1881) -- (Lee et al. 1980:817 [ref. 22416], Page & Burr 1991:252 [ref. 18983], Wydoski & Whitney 2003:213 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:10 [ref. 30399], Page & Burr 2011:480 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus marginatus (Bean 1881). Cottidae. Distribution: Washington and Oregon, U.S.A. Habitat: freshwater.

megalops, Cottocomephorus Pellegrin [J.] 1900:354 [Bulletin du Muséum National d'Histoire Naturelle (Série 1) v. 6 (no. 7); ref. 3398] Angara River, upstream of Irkutsk, Lake Baikal basin, Russia. Holotype (unique): MNHN 1897-0590. Type catalog: Blanc & Hureau 1968:49 [ref. 20738]. •Synonym of Cottocomephorus comephoroides (Berg 1900) -- (Berg 1949:1174 [ref. 20662]). •Synonym of Cottocomephorus inermis (Yakovlev 1890) -- (Taliev 1955:292 [ref. 4316], Bogdanov 2019:230 [ref. 36814]). Current status: Synonym of Cottocomephorus inermis (Yakovlev 1890). Cottidae. Habitat: freshwater.

megalops, Cottus Gratzianov [V. I.] 1902:38 [Dnevnik' Zoologicheskogo Otdelenya Obshchestva Lyubiteley Estestvoznaniya, Antropologii i Etnografii, Moskva v. 3 (no. 3); ref. 1868] Kicherskaya Bay, Lake Baikal, Russia. Holotype (unique): ZIN 9971. Genus Cyphocottus was not available from 2001, two included species after 1930 with no designation of a type species (Art. 13.3); dates to Sideleva 2003:193 [ref. 27815]. •Valid as Asprocottus megalops (Gratzianov 1902) -- (Taliev 1955:329 [ref. 4316]). •Valid as Limnocottus megalops (Gratzianov 1902) -- (Berg 1949:1162 [ref. 20662], Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:157 [ref. 23595]). •Valid as Cyphocottus megalops (Gratzianov 1902) -- (Sideleva 2001:67 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2003:18, 191 [ref. 27815] as Gratzianow, Bogutskaya & Naseka 2004:198 [ref. 28183] as Gratzianov, Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Cyphocottus megalops (Gratzianov 1902). Cottidae. Distribution: North Asia: Lake Baikal, but mainly in northern part (Russia). Habitat: freshwater.

meridionalis, Cottus Girard [C. F.] 1850:410 [Proceedings of AAAS (The American Association for the Advancement of Science) 2nd meeting, 1849; ref. 18123] James River, Virginia, U.S.A. No types known. See also Girard 1850:189 [ref. 1814] and Girard 1851:47, Pl. 1 (figs. 9-10) [ref. 18124]. •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

metae, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:156, Figs. 25-26 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] River Iscica at Ig, 45°57.444'N, 14°32.088'E, Slovenia. Holotype: ZMB 33592. Paratypes: CMK 18551 (10), FSJF 1062 (20). •Valid as Cottus metae Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:512 [ref. 29996], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:430 [ref. 33770], Sideleva et al. 2018:9 [ref. 36393], Bravničar et al. 2021: [2] 429 [ref. 38624]). Current status: Valid as Cottus metae Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Southeast Europe: Upper Sava drainage, northwest Slovenia to Medveščak Stream at Zagreb, Croatia, Danube basin. Habitat: freshwater.

microcephalus, Cottus gobio var. Kessler [K. F.] 1868:44 [Trudy i Serda Russkich Estestvoispytatelej Prilozenie Suppl.; ref. 23057] Onega District, Russia. No types known. Original not seen. This name is suppressed in favor of koshewnikowi by Freyhof et al. 2005:165 [ref. 28259]; koshewnikowi is in prevailing usage. •Synonym of Cottus poecilopus Heckel 1837 -- (Kottelat 1997:170 [ref. 22952]). •Synonym of Cottus koshewnikowi Gratzianov 1907 -- (Freyhof et al. 2005:163 [ref. 28259], Sideleva et al. 2015:34 [ref. 35276]). Nomen Oblitum. Current status: Synonym of Cottus koshewnikowi Gratzianov 1907. Cottidae. Habitat: freshwater, brackish.

microstoma, Uranidea Lockington [W. N.] 1880:58 [Proceedings of the United States National Museum v. 3 (no. 121); ref. 17549] St. Paul, Kodiak Island, Alaska, U.S.A. Lectotype: ?USNM 26992. Paralectotypes: (2). Additional material: specimens from Aleutian Is. mentioned in passing. Lectotype established (as figured specimen) in caption to Pl. 293, p. 3292 under Cottus aleuticus in Jordan & Evermann 1900 [ref. 2446] if figured specimen is identifiable. Subjectively invalid; secondarily preoccupied in Cottus by Cottus microstomus Heckel 1837; replaced by Cottus philoniips Eigenmann & Eigenmann Lectotype established (as figured specimen) in caption to Pl. 293, p. 3292 under Cottus aleuticus in Jordan & Evermann 1900 [ref. 2446] if figured specimen is identifiable. Secondarily preoccupied in Cottus by Cottus microstomus Heckel 1837; replaced by Cottus philoniips Eigenmann & Eigenmann 1892. •Synonym of Cottus aleuticus Gilbert 1896 -- (Scott & Crossman 1998:822 [ref. 24570], Mecklenburg et al. 2002:470 [ref. 25968]). 2°Homonym. Current status: Synonym of Cottus aleuticus Gilbert 1896. Cottidae. Habitat: freshwater, brackish.

microstomus, Cottus Heckel [J. J.] 1837:147, Pl. 8 (figs. 3-4) [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Vicinity of Krakow, Poland. Holotype (unique): NMW 98212. •Synonym of Cottus gobio Linnaeus 1758 -- (Berg 1949:1145 [ref. 20662], Neelov 1973:593 [ref. 7219], Kottelat 1997:169 [ref. 22952], Sideleva 1998:151 [ref. 23595]). •Valid as Cottus microstomus Heckel 1837 (often dated 1839 or 1840) -- (Bogutskaya & Naseka 2004:187 [ref. 28183], Freyhof et al. 2005:160 [ref. 28259], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2018:3 [ref. 36393]). Current status: Valid as Cottus microstomus Heckel 1837. Cottidae. Distribution: Black Sea basin (Dniestr River system) and southern Baltic basin (Vistula River system): Poland and Lithuania. Habitat: freshwater.

microstomus, Cottus poecilopus var. Jeitteles [L. H.] 1862:292, Pl. 2 (fig. 3) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 12; ref. 21181] Stream Steinbach in the Zips, Slovakia. Syntypes: whereabouts unknown. Objectively invalid; preoccupied by Cottus microstomus Heckel 1837. •Synonym of Cottus poecilopus Heckel 1837 -- (Kottelat 1997:170 [ref. 22952], Freyhof et al. 2005:167 [ref. 28259]). 1°Homonym. Current status: Synonym of Cottus poecilopus Heckel 1837. Cottidae. Habitat: freshwater.

milvensis, Cottus gobio Soldatov [V. K.] 1924:57 [Trudy Severnoi naucho-promyslovoi ekspeditsii / Vysshii sovet narodnogo khoziaistv; ref. 23056] Pechora River, near confluence with Mylva River, Russia. No types known. The species was spelled milvensis and milviensis by Soldatov; Freyhof et al. 2005:166 [ref. 28259] serve as first revisers selecting milvensis. •Synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952] as molvensis). •Synonym of Cottus koshewnikowi Gratzianov 1907 -- (Freyhof et al. 2005:163 [ref. 28259] as milvensis, Sideleva et al. 2015:34 [ref. 35276]). Current status: Synonym of Cottus koshewnikowi Gratzianov 1907. Cottidae. Habitat: freshwater.

minor, Asprocottus korjakovi Sideleva [V. G.] 2001:64 [Proceedings of the Zoological Institute, Academy of Sciences, St.-Petersburg No. 287; ref. 26181] Lake Baikal, Selenga River delta, Russia, depth 250 meters. Holotype: ZIN 49704. Paratypes: ZIN (5). •Synonym of Asprocottus korjakovi Sideleva 2001, but as a valid subspecies as described -- (Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 184 [ref. 27815], Goto et al. 2014:[15] [ref. 33456]). •Valid as Asprocottus minor Sideleva 2001 -- (Bogutskaya & Naseka 2004:195 [ref. 28183]). •Synonym of Asprocottus korjakovi Sideleva 2001 -- ( Bogdanov 2018:114 [ref. 37168]). Current status: Synonym of Asprocottus korjakovi Sideleva 2001. Cottidae. Habitat: freshwater.

minor, Procottus jeittelesi Taliev [D. N.] 1946:91 [Doklady Akademii Nauk SSSR, Ser. A (Comptes Rendus de l'Académie des Sciences de l'URSS), Leningrad v. 54 (no. 1); ref. 4315] Lake Baikal, Russia, depth 70-200 meters. No types at ZIN. Questionably available, virtually no distinguishing features. •Synonym of Procottus jeittelesii (Dybowski 1874), but a valid subspecies as described -- (Berg 1949:1169 [ref. 20662], Taliev 1955:307 [ref. 4316]). •Synonym of Procottus gurwicii [often as gurwici] (Taliev 1946) -- (Sideleva 1982:27 [ref. 14469], Sideleva 1998:158 [ref. 23595], Sideleva 2001:72 [ref. 26181], Bogutskaya & Naseka 2004:200 [ref. 28183]). Current status: Synonym of Procottus gurwicii (Taliev 1946). Cottidae. Habitat: freshwater.

multiradiatus, Batrachocottus nikolskii var. Berg [L. S.] 1907:53, Pl. 2 (fig. 2) [Die Cataphracti des Baikal-Sees; ref. 266] Lake Baikal, Russia, depth 525 meters. Lectotype: ZIN 13750. Paralectotypes: ZIN 13750-52 (1A, 1, 1). Type catalog: Sideleva & Zhidkov 2021:234 [ref. 38705]. Sideleva 2001:57 [ref. 26181] apparently wrongly lists a holotype as ZIN 13750. Lectotype selected by Sideleva 2003:156 [ref. 27815]. •Valid as Batrachocottus multiradiatus Berg 1907 -- (Berg 1949:1166 [ref. 20662], Taliev 1955:270 [ref. 4316], Sideleva 1982:28 [ref. 14469], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:149 [ref. 23595], Sideleva 1999:152 [ref. 24864], Vasil'eva 1999:154 [ref. 24864], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:57 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:15, 156 [ref. 27815], Bogutskaya & Naseka 2004:197 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569], Sideleva & Zhidkov 2021:234 [ref. 38705]). Current status: Valid as Batrachocottus multiradiatus Berg 1907. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

nasalis, Cottus Berg [L. S.] 1933:701, Figs. 671-673 [Les poissons des eaux douces de l'U.R.S.S. Part 2; ref. 279] Fergana, upper Syr-Darya River, Turkestan. Holotype (unique): ZIN 20741. Type catalog: Sideleva & Zhidkov 2021:238 [ref. 38705]. •Valid as Cottus nasalis Berg 1933 -- (Berg 1949:1150 [ref. 20662], Goto et al. 2014:[11] [ref. 33456]). •Synonym of Cottus jaxartensis Berg 1916 -- (Sideleva 2021:259 [ref. 38323], Sideleva & Zhidkov 2021:238 [ref. 38705]). Current status: Synonym of Cottus jaxartensis Berg 1916. Cottidae. Habitat: freshwater.

nigricans, Cottus Commerson [P.] in Lacepède 1801:250 [Histoire naturelle des poissons (Lacepède) v. 3; ref. 2710] Appeared as "Cottus nigricans, squamosus, scaber, aculeo obscuro ..." in account of Cottus niger; regarded as non-binominal and not available. See ICZN Opinion 89. Cottidae.

nikolskii, Cottus Berg [L. S.] 1900:346 [21], Pl. 8 (figs. 1-2) [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 5; ref. 14714] Lake Baikal near Selenga River mouth, Russia, depth 840 feet (120 Russian fathoms). Holotype (unique): ZIN 11676. Type catalog: Sideleva & Zhidkov 2021:238 [ref. 38705]. On p. 21 of separate. •Valid as Batrachocottus nikolskii (Berg 1900) -- (Berg 1949:1165 [ref. 20662], Taliev 1955:266 [ref. 4316], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:150 [ref. 23595], Sideleva 1999:149 [ref. 24864], Vasil'eva 1999:154 [ref. 24864], Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:57 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:15, 158 [ref. 27815], Bogutskaya & Naseka 2004:197 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569], Sideleva & Zhidkov 2021:238 [ref. 38705]). Current status: Valid as Batrachocottus nikolskii (Berg 1900). Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

nipponicus, Hemitripterus Ishikawa [C.] 1904:14, Pl. 7 (fig. 2) [Proceedings of the Department of Natural History, Tokyo Imperial Museum v. 1; ref. 9847] Hakodate, Oshima Subprefecture, Hokkaido, Japan. Holotype (unique): whereabouts unknown. Cottidae.

nozawae, Cottus Snyder [J. O.] 1911:537 [Proceedings of the United States National Museum v. 40 (no. 1836); ref. 4152] Ishikari River at Sapporo, Hokkaido, Japan. Holotype: USNM 68237. Paratypes: CAS-SU 21425 (2); USNM 74550 (1), 74590 (2). Type catalog: Böhlke 1953:128 [ref. 12291]. The name nozawae is the correct original spelling and should not be emended (not excluded by Art. 32); the spelling nozawai has not been established as prevailing usage, so the spelling nozawae is continued. •Synonym of Cottus amblystomopsis Schmidt 1904 -- (Berg 1949:1142 [ref. 20662]). •Synonym of Cottus pollux Günther 1873 -- (Watanabe 1960:119 [ref. 11959], Okada 1961:693 [ref. 6363], Zhang et al. 2016:193 [ref. 34477]). •Valid as Cottus nozawae Snyder 1911 -- (Yabe in Masuda et al. 1984:326 [ref. 6441], Andoh & Goto 1988:176 [ref. 22495], Kawanabe & Mizuno 1989:662 [ref. 25598], Okumura et al. 1996 [ref. 22114], Nakabo 2000:638 [ref. 25086], Goto et al. 2001:69 [ref. 25596], Pietsch et al. 2001:144 [ref. 25688], Bogutskaya et al. 2001:46 [ref. 26178], Yokoyama & Goto 2002:147 [ref. 26160], Nakabo 2002:638 [ref. 26001], Goto et al. 2002:322 [ref. 26495], Bogutskaya & Naseka 2004:187 [ref. 28183], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456], Dyldin & Orlov 2017:63 [ref. 35138], Dyldin et al. 2021:62 [ref. 38804] with question). Current status: Valid as Cottus nozawae Snyder 1911. Cottidae. Distribution: Northwestern Pacific: Japan and Korea. Habitat: freshwater.

nudus, Cottus Sideleva [V. G.] 2021:259, Figs. 7-9 [Voprosy Ikhtiologii v. 61 (no. 3); ref. 38323] Mashat River near Kershetas, tributary of the Arys River, Syr-Darya basin, Kazakhstan. Holotype: ZIN 56577. Preoccupied by Cottus kessleri nudus Dybowski 1908, permanently invalid. •Not valid as Cottus nudus Sideleva 2021. 1°Homonym. Current status: Synonym of Cottus. Cottidae. Habitat: freshwater.

nudus, Cottus kessleri var. Dybowski [B. N.] 1908:545 [10] [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Syntypes: whereabouts unknown. •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Kottelat 2006:60 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

nudus, Cottus knerii var. Dybowski [B. N.] 1908:546 [11] [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Syntypes: whereabouts unknown. •Synonym of Paracottus knerii (Dybowski 1874). Current status: Synonym of Paracottus knerii (Dybowski 1874). Cottidae. Habitat: freshwater.

ohmiensis, Cottus Watanabe [M.] 1960:123, Fig. 45, Pl. 30 (fig. 2) [Fauna Japonica: Cottidae (Pisces); ref. 11959] Chinai River, Takashima-gun, and Ado River, Takashima-gun, Shiga Prefecture; and Tama River, Nishitama-gun, Tôkyô-to, Japan. Syntypes: (46). Cottidae. Habitat: freshwater.

onychus, Cottus Eigenmann [C. H.] & Eigenmann [R. S.] 1892:963 [American Naturalist v. 26 (no. 311); ref. 12339] Bow River at Calgary, tributary of South Saskatchewan, Alberta, Canada. Holotype (unique): BMNH 1892.12.30.234. •Synonym of Cottus ricei (Nelson 1876) -- (Scott & Crossman 1998:842 [ref. 24570]). Current status: Synonym of Cottus ricei (Nelson 1876). Cottidae. Habitat: freshwater.

oyamai, Astrocottus Watanabe [M.] 1958:221, Figs. 73-74, Pl. 4 [Studies of Japanese cottid fishes; ref. 21357] Misaki, Kanagawa Perf., Japan, depth 70 fathoms. Holotype (unique): apparently lost. Also described as new in Watanabe 1960:27, pl. 19 (fig. 1) [ref. 11959]. See Tsuruoka et al. 21008:36 [ref. 29568] for comments on discrepancies in the original description. •Valid as Astrocottus oyamai Watanabe 1958 -- (Yabe in Masuda et al. 1984:325 [ref. 6441], Nakabo 2000:632 [ref. 25086], Nakabo 2002:632 [ref. 26001]). •Nomen dubium, not in Astrocottus -- (Tsuruoka et al. 2008:36 [ref. 29568]). Nomen Dubium. Cottidae. Distribution: Western North Pacific: Japan [if valid]. Habitat: marine.

pachytus, Batrachocottus baicalensis Taliev [D. N.] 1955:262, Figs. 22B, 104 [ ref. 4316] Near settlement of B. Koty, Lake Baikal, Russia, depth 80-120 meters. Holotype: ZIN (lost). Appeared without distinguishing features in Taliev 1948:107, 113 [ref. 19628]. •Synonym of Batrachocottus baicalensis (Dybowski 1874) -- (Sideleva 1982:28 [ref. 14469], Sideleva 1998:149 [ref. 23595], Sideleva 1999:149 [ref. 24864], Sideleva 2001:57 [ref. 26181], Sideleva 2003:15 [ref. 27815]). Current status: Synonym of Batrachocottus baicalensis (Dybowski 1874). Cottidae. Habitat: freshwater.

pallidus, Limnocottus Taliev [D. N.] 1948:113, 128 table [Trudy Baikal'skoi Limnologicheskoi Stantsii v. 12; ref. 19628] Lake Baikal, Russia. No types at ZIN. Can date to above reference based on morphometrics presented in the table. Also appeared as new in Taliev 1955:86, 121, 148, 200, 357 [ref. 4316] as Abyssocottus pallidus. Neotype [ZIN 13744] apparently designated by Sideleva but not in conformance with the fourth edition of the Code and is unavailable. •Valid as Limnocottus pallidus Taliev 1948 -- (Sideleva 1982:30 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:157 [ref. 23595], Sideleva 2001:68 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:18, 198 [ref. 27815], Bogutskaya & Naseka 2004:199 [ref. 28183] dated 1955, Goto et al. 2014:[15] [ref. 33456], Bogdanov 2017:47 [ref. 37119], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Limnocottus pallidus Taliev 1948. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

paltschevskii, Cottus (Pegedictis) Schmidt [P. Yu.] 1916:614, Fig. 2 [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 20 (for 1915); ref. 3935] Sakhabe River, tributary to Ternay Bay, Tatar Strait, Russia. Syntypes: ZIN 18959 (3). Original spelling should be studied. •Synonym of Cottus czerskii Berg 1913 -- (Berg 1949:1140 [ref. 20662], Sideleva 1998:151 [ref. 23595], Parin et al. 2002:S73 [ref. 28300] as palischevskii, Parin et al. 2014:242 [ref. 33547]). Current status: Synonym of Cottus czerskii Berg 1913. Cottidae. Habitat: freshwater.

parmiferus, Asprocottus herzensteini Taliev [D. N.] 1955:194, 319, Figs. 43, 69, 127 [ ref. 4316] Lake Baikal, Russia. Taliev specimens: ZIN 33012 (1), 33017 (1), 34301 (5). Sideleva 2001:67 [ref. 26181] lists a neotype [ZIN 49702] but that is invalid under the code. This is again treated as neotype in Sideleva 2003:185 [ref. 27815]. •Valid as Asprocottus parmiferus Taliev 1955 -- (Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:156 [ref. 23595], Sideleva 2001:67 [ref. 26181], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2003:17, 185 [ref. 27815], Bogutskaya & Naseka 2004:195 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:119 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus parmiferus Taliev 1955. Cottidae. Distribution: North Asia: Lake Baikal, but mainly in northern and central parts (Russia). Habitat: freshwater.

parvus, Cottopsis Girard [C. F.] 1854:144 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 7; ref. 5769] Presidio, San Francisco, California, U.S.A. Syntypes: USNM 294 (2, not found in 1980). •Synonym of Cottus asper Richardson 1836 -- (Scott & Crossman 1998:825 [ref. 24570]). Current status: Synonym of Cottus asper Richardson 1836. Cottidae. Habitat: freshwater, brackish, marine.

paulus, Cottus Williams [J. D.] 2000:302 [Copeia 2000 (no. 1); ref. 24258] Coldwater Spring, 5.7 miles west of Oxford about 500 yards north of U.S. highway 78, tributary of Coosa River, Calhoun County, Alabama, U.S.A. Holotype: UMMZ 187462. Paratypes: ALA 2031 (12), 1138 (39), 1665 (68); CUMV 52064 [ex ALA 1063] (26); TU 34396 (47); UMMZ 187463 (25); USNM 201404 [ex ALA 1063] (26). Replacement name for Cottus pygmaeus Williams 1968, preoccupied by Cottus quadricornis pygmaeus Lönnberg 1932. •Valid as Cottus paulus Williams 2000 -- (Kinziger et al. 2000:1007 [ref. 25019], Nelson et al. 2004:119 [ref. 27807], Boschung & Mayden 2004:424 [ref. 27995], Neely et al. 2007:651 [ref. 29262], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:476 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Replacement Name. Current status: Valid as Cottus paulus Williams 2000. Cottidae. Distribution: Coldwater Spring, Coosa River system, Alabama, U.S.A. Habitat: freshwater.

pelagicus, Paracottus Taliev [D. N.] 1955:48 et seq., 252, Figs. 99-100 [ ref. 4316] Near town of Slyudyanka, Lake Baikal, Russia, depth 4-40 meters. Syntypes: ZIN (not found in 1996). As Paracottus (Leocottus) pelagicus on p. 252. •Valid as Paracottus pelagicus Taliev 1955 -- (Taliev 1955:114 [ref. 4316]). •Synonym of Paracottus knerii (Dybowski 1874) -- (Sideleva 1982:16 [ref. 14469]). •Synonym of Cottus kesslerii Dybowski 1874 -- (Sideleva 1998:152 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 151 [ref. 27815]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

pellegrini, Cottus gobio natio Vladykov [V. D.] 1931:353, Fig. 28 [Mémoires de la Société Zoologique de France v. 29 (no. 4); ref. 16343] Type catalog: Blanc & Hureau 1968:51 [ref. 20738] with MNHN 1930-220 to 223 (4) as syntypes; Sanda et al. 2010:30 [ref. 31086] with paralectotypes and a lectotype designated by Freyhof et al. 2005 [MNHN 1930-222].. Not available, infrasubspecific; from Tisza basin, Ukraine. Validly published by Bacescu & Nacescu-Mester 1964. •In the synonymy of Cottus gobio Linnaeus 1758 -- (Berg 1949:1331 [ref. 20662]). Infrasubspecific. Current status: Synonym of Cottus gobio Linnaeus 1758. Cottidae.

pellegrini, Cottus gobio Bǎcescu [M. C.] & Bǎcescu-Meşter [L.] 1964:442 [Vie et Milieu Suppl. No. 17; ref. 1238] Carpathes range in Ukraine, Danube basin, Teresva, Ukraine. Lectotype: MNHN. Syntypes: CUP; MNHN 1930-0220 to 0223 (4, niow 3); many at NMP. Type catalog: Mlíkovský et al. 2011:154 [ref. 33498]. Lectotype apparently designated by Freyhof et al. 2005. Available as a subspecies by indication to infrasubspecific treatment by Vladykov 1931. •Synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952], Freyhof et al. 2005:125 [ref. 28259]). Current status: Synonym of Cottus gobio Linnaeus 1758. Cottidae. Habitat: freshwater, brackish.

perifretum, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:144, Figs. 18-20 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] Stream Zwaanebeek, 51°14'44N, 4°34'58'E, Province Flandern, Belgium. Holotype: ZMB 33588. Paratypes: FSJF 1383 (15). Plus non-type material. Previously misspelled perifrenatum. •Valid as Cottus perifretum Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:513 [ref. 29996], Sideleva 2009:210 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393], Bravničar et al. 2021: [2] 429 [ref. 38624]). Current status: Valid as Cottus perifretum Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Northern Europe. Habitat: freshwater.

perplexus, Cottus Gilbert [C. H.] & Evermann [B. W.] 1894:202, Pl. 20 (fig. 1) [Bulletin of the U. S. Fish Commission v. 14 (art. 16) (for 1894); ref. 12377] Shookumchuck River, near Chehalis, Washington, U.S.A. Holotype: USNM 45387. Paratypes: (12) BMNH 1897.1.12.13 (1), 1900.9.29.197 (1); CAS-SU 1324 (17), ?1343 (missing, wrong no.); NMW 11458 (1); USNM 45388 (24). Type catalog: Böhlke 1953:128 [ref. 12291]. •Valid as Cottus perplexus Gilbert & Evermann 1894 -- (Lee et al. 1980:818 [ref. 22416], Page & Burr 1991:253 [ref. 18983], Moyle 2002:354 [ref. 26449], Wydoski & Whitney 2003:212 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:481 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus perplexus Gilbert & Evermann 1894. Cottidae. Distribution: Northwestern U.S.A.: Washington, Oregon and California. Habitat: freshwater.

petiti, Cottus Bǎcescu [M. C.] & Bǎcescu-Meşter [L.] 1964:432, Figs. 1-4; Pls. 1-2 [Vie et Milieu Suppl. No. 17; ref. 1238] Sources of river Lez, France. Holotype: MGAB 50. Paratypes: ?BMNH 1964.12.23.10 [from Bacescu] (1); MGAB 51 (1) + uncat. (15). See Lelek 1987:274 [ref. 22962]. •Valid as Cottus petiti Bǎcescu & Bǎcescu-Meşter -- (Kottelat 1997:170 [ref. 22952], Freyhof et al. 2005:142 [ref. 28259], Kottelat & Freyhof 2007:515 [ref. 29996], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus petiti Bǎcescu & Bǎcescu-Meşter 1964. Cottidae. Distribution: France. Habitat: freshwater.

philonips, Cottus Eigenmann [C. H.] & Eigenmann [R. S.] 1892:963 [American Naturalist v. 26 (no. 311); ref. 12339] Kicking Horse River, Field, British Columbia, Canada. Syntypes: BMNH 1892.12.30.235-244 (10), 1892.12.20.245 (1); CAS-SU 527 (1); USNM 125483 (1). Type catalog: Böhlke 1953:128 [ref. 12291]. Text somewhat unclear; tentatively proposed for specimens that "are probably to be referred to the description quoted above"; quoted above are Cottus minutus Pallas and Uranidea microstomus Lockington 1880 (the latter noted as preoccupied in Cottus by Cottus microstomus Heckel 1837). We regard as an independent proposal of a new name (not a replacement name); however, Hubbs & Schultz 1932 state, "..we rule as first revisers that Cottus philonips was proposed as a substitute name for Cottus minutus Pallas and not for Uranidea microstoma Lockington." Under the circumstances, action of a first reviser is probably inappropriate; minutus was not in fact preoccupied. •Synonym of Cottus cognatus Richardson 1836 -- (Lee et al. 1980:808 [ref. 22416], Scott & Crossman 1998:835 [ref. 24570]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

pitensis, Cottus Bailey [R. M.] & Bond [C. E.] 1963:20, Figs. 1d, 3b, 4d [Occasional Papers of the Museum of Zoology University of Michigan No. 634; ref. 3934] North Fork of Pit River, east of Alturas, Modoc County, California, U.S.A. Holotype: UMMZ 130558. Paratypes: UMMZ 130559 (6). Additional material at CAS 25963 (37), OSU, and UMMZ [ex CAS 25963] (4). •Valid as Cottus pitensis Bailey & Bond 1963 -- (Lee et al. 1980:819 [ref. 22416], Page & Burr 1991:253 [ref. 18983], Moyle 2002:353 [ref. 26449], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:482 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus pitensis Bailey & Bond 1963. Cottidae. Distribution: Western U.S.A.: Oregon and California. Habitat: freshwater.

platycephalus, Asprocottus herzensteini Taliev [D. N.] 1955:324, Figs. 130-131 [ ref. 4316] Lake Baikal, Russia. Neotype: ZIN 46863. Taliev specimens: ZIN 33038 (2). Appeared as Asprocottus herzensteini brevis, name only, in Taliev 1948:113 [ref. 4316]. •Valid as Asprocottus platycephalus Taliev 1955 [usually dated to 1948] -- (Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702] dating to 1948, Sideleva 1998:156 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2001:67 [ref. 26181], Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 187 [ref. 27815], Bogutskaya & Naseka 2004:196 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:119 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus platycephalus Taliev 1955. Cottidae. Distribution: North Asia: Lake Baikal, but mainly in northern part (Russia). Habitat: freshwater.

poecilopus, Cottus Heckel [J. J.] 1837:145, Pl. 8 (figs. 1-2) [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Amur mountain brooks of Carpathians at Grosschagendorf near Kaesnark in Upper Hungary [now Slovakia]. Syntypes: NMW 6424 (1), 6729 (3), 78816 (2). See Kottelat 1997:170 [ref. 22952] for locality information. •Valid as Cottus poecilopus [sometimes as pocilopus] Heckel 1837 (often dated 1839 or 1840) -- (Berg 1949:1143 [ref. 20662], Sideleva 1982:81 [ref. 14469], Fedorov in Whitehead et al. 1986:1248 [ref. 13677], Lelek 1987:278 [ref. 22962], Kim & Youn 1992:60 [ref. 22287], Zhu 1995:189 [ref. 25213], Chereshnev 1996:606 [ref. 24659], Kottelat 1997:170 [ref. 22952], Kim 1997:402 [ref. 24032], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:152 [ref. 23595], Sheiko & Fedorov 2000:27 [ref. 25650] as cf. poecilopus, Bogutskaya et al. 2001:46 [ref. 26178], Chereshnev et al. 2001:119 [ref. 26736], Pietsch et al. 2001:144 [ref. 25688], Kim & Park 2002:323 [ref. 25913], Choi et al. 2003:262, 573 [ref. 26218], Parin et al. 2002:S73 [ref. 28300], Fedorov et al. 2003:67 [ref. 27579] as cf. poecilopus, Jang et al. 2003:120 [ref. 27681], Hanel 2003:61 [ref. 27894], Bogutskaya & Naseka 2004:188 [ref. 28183] as cf. poecilopus, Knaack 2003:17 [ref. 28219], Fujii et al. 2005:12 [ref. 28191], Freyhof et al. 2005:167 [ref. 28259], Hanel & Lusk 2005:341 [ref. 28804], Kottelat 2006:91 [ref. 28831], Fricke 2007:26 [ref. 30577], Shedko & Miroshnichenko 2007:24 [ref. 29369], Kottelat & Freyhof 2007:515 [ref. 29996], Sideleva & Goto 2009:599 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:244 [ref. 33547], Sideleva et al. 2015:430 [ref. 33770], Zhang et al. 2016:193 [ref. 34477] dated 1836). Current status: Valid as Cottus poecilopus Heckel 1837. Cottidae. Distribution: Northern Europe. Habitat: freshwater, brackish.

pollicaris, Uranidea Jordan [D. S.] & Gilbert [C. H.] 1882:222 [Proceedings of the United States National Museum v. 5 (no. 277); ref. 18349] Lake Michigan off Racine, Wisconsin, U.S.A. Holotype (unique): USNM 29663. •Synonym of Cottus ricei (Nelson 1876) -- (Scott & Crossman 1998:842 [ref. 24570]). Current status: Synonym of Cottus ricei (Nelson 1876). Cottidae. Habitat: freshwater.

pollux, Cottus Günther [A.] 1873:240 [Annals and Magazine of Natural History (Series 4) v. 12 (no. 69) (art. 31); ref. 2004] River at Otarranai, Japan. Syntypes: BMNH 1873.4.30.1-2 (2). See also Nakabo 2002:1525 [ref. 26001]. •Valid as Cottus pollux Günther 1873 -- (Watanabe 1960:119 [ref. 11959], Okada 1961:693 [ref. 6363], Yabe in Masuda et al. 1984:326 [ref. 6441], Kawanabe & Mizuno 1989:666 [ref. 25598], Zhu 1995:189 [ref. 25213], Nakabo 2000:638 [ref. 25086], Matsuura et al. 2000:207 [ref. 26000], Nakabo 2002:638 [ref. 26001], Goto et al. 2002:318 [ref. 26495], Hagiwara 2003:37 [ref. 27188], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456], Zhang et al. 2016:193 [ref. 34477]). Current status: Valid as Cottus pollux Günther 1873. Cottidae. Distribution: Japan and ? China. Habitat: freshwater.

polyporus, Cottus klamathensis Daniels [R. A.] & Moyle [P. B.] 1984:958 [Copeia 1984 (no. 4); ref. 8977] Klamath River, Siskiyou County, California, U.S.A. Holotype: NYSM 11451. Paratypes: NYSM 11452 (1). Based on 40 specimens; holotype and 1 paratype listed on p. 951; additional specimens are therefore regarded as additional non-type material. •Synonym of Cottus klamathensis Gilbert 1898, but a valid subspecies polyporus Daniels & Moyle as described -- (Moyle 2002:356 [ref. 26449], Scharpf 2008:10 [ref. 30399], Page & Burr 2011:483 [ref. 31215]). Current status: Synonym of Cottus klamathensis Gilbert 1898. Cottidae. Distribution: Klamath River and tributaries, Oregon and California, U.S.A. [subspecies polyporus]. Habitat: freshwater.

princeps, Cottus Gilbert [C. H.] 1898:12, Fig. [Bulletin of the U. S. Fish Commission v. 17 (art. 1) [1897]; ref. 12349] Upper Klamath Lake, Oregon, U.S.A. Holotype: USNM 48227. Paratypes: (numerous). •Valid as Cottus princeps Gilbert 1898 -- (Lee et al. 1980:820 [ref. 22416], Page & Burr 1991:248 [ref. 18983], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:472 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus princeps Gilbert 1898. Cottidae. Distribution: Oregon, U.S.A. Habitat: freshwater.

produndulus, Procottus jeittelesi Taliev [D. N.] 1948:113 [Trudy Baikal'skoi Limnologicheskoi Stantsii v. 12; ref. 19628] Not available, appeared as manuscript name in table; apparently not subsequently used by Taliev. Nomen Nudum. Cottidae.

protrusus, Cottus Schultz [L. P.] & Spoor [W. A.] 1933:142 [Copeia 1933 (no. 3); ref. 16522] Small lake on Unalaska Island, about 400 feet above Makushin Bay, Aleutian Islands. Holotype: USNM 104496 [ex UW 2334]. Paratypes: (5) UMMZ 64234 (1). •Synonym of Cottus aleuticus Gilbert 1896 -- (Lee et al. 1980:801 [ref. 22416], Scott & Crossman 1998:820 [ref. 24570], Mecklenburg et al. 2002:470 [ref. 25968]). Current status: Synonym of Cottus aleuticus Gilbert 1896. Cottidae. Habitat: freshwater, brackish.

pulcher, Asprocottus Taliev [D. N.] 1955:69 et seq., 327, Figs. 23, 134-135 [ ref. 4316] Lake Baikal, Russia. Syntypes: not found at ZIN. Appeared without distinguishing features and unavailable as Cottinella pulchra in Taliev 1948:113, 118 [ref. 19628]. Sideleva 2001:67 [ref. 26181] lists a neotype [ZIN 50873] but that is invalid under the code if this is the first time it appeared; same neotype listed in Sideleva 2003:188 [ref. 27815]. •Valid as Asprocottus pulcher Taliev 1955 [usually dated to 1948] -- (Taliev 1955:69 [ref. 4316], Sideleva 1982:29 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702] dating to 1948, Sideleva 1998:156 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178] dating to 1948, Kontula et al. 2003:149 [ref. 26791], Sideleva 2003:17, 188 [ref. 27815], Bogutskaya & Naseka 2004:196 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Bogdanov 2018:120 [ref. 37168], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Asprocottus pulcher Taliev 1955. Cottidae. Distribution: North Asia: northern part of Lake Baikal (Russia). Habitat: freshwater.

pumilus, Abyssocottus Bogdanov [B. E.] 2013:94, Fig. 1c [Baikalskiy zoologicheskiy zhurnal [Baikal zoological journal, Irkutsk] No. 13 (2013 no. 2); ref. 37118] Buguldey Isthmus, Lake Baikal, Russia, depth 508-517 meters. Holotype: Field number 173-06-32. Paratypes: (12). Type depository unknown. •Valid as Abyssocottus pumilus Bogdanov 2013. Current status: Valid as Abyssocottus pumilus Bogdanov 2013. Cottidae. Distribution: Lake Baikal, Russia. Habitat: freshwater.

punctulatus, Potamocottus Gill [T. N.] 1861:40 [Proceedings of the Boston Society of Natural History v. 8 (1861-1862); ref. 1785] Bridger Pass, Wyoming, U.S.A. Holotype (unique): ?USNM 3251 (not found in 1980). •Synonym of Cottus bairdii Girard 1850 -- (Baxter & Stone 1995:221 [ref. 23374]). •Synonym of Cottus bairdii Girard 1850, but a valid subspecies punctulatus (Gill 1861) -- (Scharpf 2008:8 [ref. 30399]). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Distribution: Western U.S.A. : Colorado, Utah, Wyoming and New Mexico [this subspecies]. Habitat: freshwater.

putorania, Paracottus (Paracottus) kneri Koryakov [E. A.] & Sidelev [G. N.] 1976:555 [Voprosy Ikhtiologii v. 16 (no. 3); ref. 9001] Lake Agatha, Enisei River basin, Russia. Syntypes: whereabouts unknown. On p. 500 or English translation. •Synonym of Paracottus knerii (Dybowski 1874), but a valid subspecies putorania Koryakov & Sidelev 1976 as described -- (Sideleva 1982:28 [ref. 14469], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:153 [ref. 23595], Sideleva 2001:59 [ref. 26181]). Current status: Synonym of Paracottus knerii (Dybowski 1874). Cottidae. Habitat: freshwater.

pygmaeus, Cottus Williams [J. D.] 1968:334, Fig. 1 [Copeia 1968 (no. 2); ref. 7934] Spring, 5.7 miles west of Oxford about 500 yards north of U.S. highway 78, tributary of Coosa River, Calhoun County, Alabama, U.S.A. Holotype: UMMZ 187462. Paratypes: ALA 2031 (12), 1138 (39), 1665 (68); CUMB 52064 [ex ALA 1063] (26); TU 34396 (47); UMMZ 187463 (25); USNM 201404 [ex ALA 1063] (26). Type catalog: Suttkus 1970:128 [ref. 20861], Bart & Taylor 1993:67 [ref. 20906]. Objectively invalid; preoccupied by Cottus quadricornis pygmaeus Lönnberg 1932; replaced by Cottus paulus Williams 2000. •Treated as valid as Cottus pygmaeus Williams 1968 -- (Lee et al. 1980:821 [ref. 22416], Page & Burr 1991:252 [ref. 18983], Boschung 1992:102 [ref. 23239], Mettee et al. 1996:495 [ref. 25836]). 1°Homonym. Current status: Synonym of Cottus paulus Williams 2000. Cottidae. Habitat: freshwater.

quiescens, Uranidea DeKay [J. E.] 1842:61, Pl. 5 (fig. 14) [Zoology of New-York; ref. 1098] Round Lake and Lake Pleasant, New York, U.S.A. Syntypes: New York State coll. (whereabouts unknown). •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186], Scott & Crossman 1998:835 [ref. 24570]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

reinii, Cottus Hilgendorf [F. M.] 1879:105 [Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin 1879; ref. 21467] Hakodate and southern Nippon, Japan. Syntypes: ZMB 10627 (1) s. Nippon, 10629 (3) Hakodate. Type catalog: Paepke & Fricke 1992:283 [ref. 19946]. See also Nakabo 2002:1525 [ref. 26001]. •Valid as Cottus reinii Hilgendorf 1879 -- (Okada 1961:706 [ref. 6363], Yabe in Masuda et al. 1984:326 [ref. 6441], Kawanabe & Mizuno 1989:668 [ref. 25598], Nakabo 2000:638 [ref. 25086], Matsuura et al. 2000:210 [ref. 26000], Nakabo 2002:638 [ref. 26001], Hagiwara 2003:37 [ref. 27188], Fujii et al. 2005:12 [ref. 28191], Goto et al. 2014:[9] [ref. 33456]). Current status: Valid as Cottus reinii Hilgendorf 1879. Cottidae. Distribution: Western North Pacific. Habitat: freshwater.

retusifrons, Cottus Gronow [L. T.] in Gray 1854:103 [Catalogue of fish collected and described by Laurence Theodore Gronow; ref. 1911] English Sea. No types known. Cottidae.

rhenanus, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:148, Figs. 21-22 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] Upper reaches of stream Wahnbach at Neunkirchen, 50°51'N, 7°20'E, Germany. Holotype: ZMB 33589. Paratypes: CMK 17844 (20), FSFJ 503 (40), ZMB 33590 (20). Plus non-type material. •Valid as Cottus rhenanus Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:516 [ref. 29996], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus rhenanus Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Europe. Habitat: freshwater.

rhothea, Uranidea Smith [R.] 1882:347 [Proceedings of the United States National Museum v. 5 (no. 286); ref. 18726] Falls of Spokane River, Washington, U.S.A. Syntypes: USNM 30737 (2), plus 2 more. •Valid as Cottus rhotheus (Smith 1882) -- (Lee et al. 1980:822 [ref. 22416], McAllister 1990:197 [ref. 14674], Page & Burr 1991:245 [ref. 18983], Scott & Crossman 1998:837 [ref. 24570], Wydoski & Whitney 2003:214 [ref. 27816], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:481 [ref. 31199], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:469 [ref. 31215], Page et al. 2013:122 [ref. 32708], LeMone et al. 2014:249 [ref. 33134], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus rhotheus (Smith 1882). Cottidae. Distribution: Southwestern Canada and northwestern U.S.A. (Washington, Idaho and Montana). Habitat: freshwater.

ricei, Cottopsis Nelson [E. W.] 1876:40 [Bulletin of the Illinois Museum of Natural History v. 1 (no. 1); ref. 3154] Lake Michigan near Evanston, Cook County, Illinois, U.S.A. Holotype (unique): whereabouts unknown, not at INHS. Type catalog: Sabaj et al. 1997:291 [ref. 23225]. •Valid as Cottus ricei (Nelson 1876) -- (Lee et al. 1980:823 [ref. 22416], Smith 1986:358 [ref. 22186], McAllister 1990:197 [ref. 14674], Page & Burr 1991:245 [ref. 18983], Chereshnev 1996:606 [ref. 24659], Scott & Crossman 1998:839 [ref. 24570], Lyons et al. 2000:42 [ref. 26594], Bailey et al. 2004:172 [ref. 27882], Nelson et al. 2004:119 [ref. 27807], McPhail 2007:486 [ref. 31199], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:468 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus ricei (Nelson 1876). Cottidae. Distribution: Canada and northern U.S.A. Habitat: freshwater.

richardsoni, Cottus Agassiz [L.] 1850:300 [Lake Superior; ref. 66] Montreal River, North America. Syntypes: whereabouts unknown. •Synonym of Cottus bairdii Girard 1850 -- (Scott & Crossman 1998:830 [ref. 24570] as bairdi). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

richardsonii, Trachidermus Heckel [J. J.] 1837:162 [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Columbia River at Fort Vancouver, Vancouver, southern Washington, U.S.A. Unneeded new name for Cottus asper Richardson. •Synonym of Cottus asper Richardson 1836 -- (Scott & Crossman 1998:825 [ref. 24570]). Current status: Synonym of Cottus asper Richardson 1836. Cottidae. Habitat: freshwater, brackish.

rondeleti, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:140, Fig. 15 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] 1 kilometer south of Brissac, 3 kilometers southwest of St. Bauzille-de-Putois, 43°39'N, 3°15'E, creek tributary of Hérault River, Dept. Hérault, France. Holotype: MNHN 2005-0757. Paratypes: CMK 13008 (8), 18516 (3), 18518 (2); FSJF 1655 (2); MNHN 2005-0758 (4). •Valid as Cottus rondeleti Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:517 [ref. 29996], Goto et al. 2014:[11] [ref. 33456]). Current status: Valid as Cottus rondeleti Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Hérrault drainage, France. Habitat: freshwater.

roseus, Cottus gobio var. Odenwall [E.] 1927:56 [Memoranda Societatis pro Fauna et Flora Fennica. v. 2; ref. 15808] Lappajärvi Sjö, Finland. Syntypes: Zool. Mus. Helsinki. •Synonym of Cottus gobio Linnaeus 1758 -- (Berg 1949:1145 [ref. 20662]). Current status: Synonym of Cottus gobio Linnaeus 1758. Cottidae. Habitat: freshwater, brackish.

sabaudicus, Cottus Sideleva [V. G.] 2009:211, Figs. 2-3 [Journal of Ichthyology v. 49 (no. 3); ref. 30173] Filiere River, upper reaches of the Rhone River, Savoy Alps, Haute-Savoy district, southeastern France. Holotype: MNHN 1960-0373. Paratypes: MNHN 1960-0374 (1), 1960-0375 (1). •Valid as Cottus sabaudicus Sideleva 2009 -- (Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus sabaudicus Sideleva 2009. Cottidae. Distribution: Tributaries of the upper course of the Rhone River, France. Habitat: freshwater.

scaturigo, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:152, Figs. 23-24 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] Timavo spring, southwest of Monfalcone, 45°47.24'N, 13°35.29"E, Province Friuli-Venezia, Italy. Holotype: ZMB 33591. Paratypes: FSJF 181 (12), 219 (10), 1020 (5); CMK 18550 (5). •Synonym of Cottus gobio (Linnaeus 1758) -- (Bianco & Delmastro 2011:6 [ref. 31648] as scaturigio, Bianco 2013:10 [ref. 32897]). •Valid as Cottus scaturigo Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:517 [ref. 29996], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Lorenzoni et al. 2019:253 [ref. 37108]). •Synonym of Cottus metae Freyhof, Kottelat & Nolte 2005 -- (Bravničar et al. 2021: [12] 439 [ref. 38624]). Current status: Synonym of Cottus metae Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Southern Europe: northeastern Italy and Croatia [if valid]. Habitat: freshwater.

schitsuumsh, Cottus LeMoine [M.], Young [M. K.], McKelvey [K. S.], Eby [L.], Pilgrim [K. L.] & Schwartz [M. K.] 2014:244, Figs. 4-7 [Zootaxa 3755 (no. 3); ref. 33134] East Fork Steamboat Creek, a tributary of the Coeur d'Alene River at West Fork Road, 47.71821°N, 116.20010°W, Shoshone County, Idaho. Holotype: UW 151670. Paratypes: UW 151671 (3). Plus additional non-type specimens. •Valid as Cottus schitsuumsh LeMoine, Young, McKelvey, Eby, Pilgrim & Schwartz 2014. Current status: Valid as Cottus schitsuumsh LeMoine, Young, McKelvey, Eby, Pilgrim & Schwartz 2014. Cottidae. Distribution: Idaho and Montana, USA. Habitat: freshwater.

schlegelii, Centridermichthys Döderlein [L.] in Steindachner & Döderlein 1884:210 [42] [Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 49 (1. Abth.); ref. 4248] Tokyo, Japan. Syntypes: NMW 6373 (1), ?ZMB 12079 (1). Type catalog: Paepke & Fricke 1992:282 [ref. 19946]. Type information (ZMB) from Amaoka & Fujii 1999:163 [ref. 26515]. Cottidae.

semiscaber, Cottopsis Cope [E. D.] 1872:476 [U. S. Geological Survey Territitories Annual Report v. 5 (pt 4); ref. 923] Fort Hall, Idaho, U.S.A. Syntypes: (3) whereabouts unknown. Type catalog: Böhlke 1984:66 [ref. 13621] as none at ANSP. •Synonym of Cottus bairdii Girard 1850, but a valid subspecies -- (La Rivers 1994:586 [ref. 23389] as bairdi, Scharpf 2008:8 [ref. 30399]). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Distribution: Bonneville Basin and upper Snake River, Utah, Nevada and Idaho, U.S.A. [this subspecies]. Habitat: freshwater.

shasta, Cottus Jordan [D. S.] & Starks [E. C.] in Jordan 1896:224 [Proceedings of the California Academy of Sciences (Series 2) v. 6; ref. 2395] McCloud River at Baird, Shasta County, California, U.S.A. Syntypes: BMNH 1897.1.12.14 (1), CAS-SU 4196 (4, now 3). Type catalog: Böhlke 1953:128 [ref. 12291]. •Synonym of Cottus gulosus (Girard 1854) -- (Lee et al. 1980:814 [ref. 22416]). Current status: Synonym of Cottus gulosus (Girard 1854). Cottidae. Habitat: freshwater.

sibiricus, Cottus Warpachowski [N. A.] 1889:12 [Zapiski Ak. Nauk St. Petersburg 1889; ref. 19906] Yenisei [Enisei] River near Minusinsk Town. Lectotype: ZIN 6328. Paralectotypes: ZIN 6208 (1), 6330 (1), ZIN 56235 (1). Lectotype designated by Sideleva 2017:828 [ref. 35715]. •Valid as Cottus sibiricus Warpachowski 1889 (author sometimes seen as Kessler) -- (Berg 1949:1148 [ref. 20662], Sideleva 1982:81 [ref. 14469], Mitrofanov & Dukravec 1989:282 [ref. 37748], Chereshnev 1996:606 [ref. 24659], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:152 [ref. 23595], Bogutskaya et al. 2001:46 [ref. 26178], Parin et al. 2002:S73 [ref. 28300], Bogutskaya & Naseka 2004:188 [ref. 28183], Ocock et al. 2006:57 [ref. 28933], Kottelat 2006:91 [ref. 28831], Shedko & Miroshnichenko 2007:24 [ref. 29369], Bogdanov & Knizhin 2007:271 [ref. 31009], Goto et al. 2014:[10] [ref. 33456], Parin et al. 2014:244 [ref. 33547], Romanov et al. 2017:826 [ref. 35687], Sideleva 2017:828 [ref. 35715]). Current status: Valid as Cottus sibiricus Warpachowski 1889. Cottidae. Distribution: Northern Asia: Russia and Mongolia. Habitat: freshwater, brackish.

siemienkiewiczii, Cottocomephorus grewingkii var. Dybowski [B. N.] 1908:559 [24], Fig. 20 [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Holotype (unique). Type not in ZIN. •Synonym of Cottocomephorus comephoroides (Berg 1900) -- (Bogdanov 2019:230 [ref. 36814]). Current status: Synonym of Cottocomephorus comephoroides (Berg 1900). Cottidae. Habitat: freshwater.

simus, Cottus Hermann [J.] 1804:302 [Observationes zoologicae; ref. 2146] No locality. Originally as Cottus ? simus. Cottidae.

specus, Cottus Adams [G. L.] & Burr [B. M.] in Adams, Burr, Day & Starkey 2013:488, Figs. 4-5 [Zootaxa 3609 (no. 5); ref. 32429] Mystery Cave, Perry County, Missouri. Holotype: SIUC 88001. Paratypes: SIUC 88002 (2), USNM 409781 (2). Plus additional non-type material. •Valid as Cottus specus Adams & Burr 2013. Current status: Valid as Cottus specus Adams & Burr 2013. Cottidae. Distribution: Southeastern Missouri, U.S.A. Habitat: freshwater.

spilota, Uranidea Cope [E. D.] 1865:82 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 17; ref. 907] Grand Rapids, on the Grand River, Michigan, U.S.A. Lectotype: ANSP 11061 (missing). Paralectotypes: ANSP 11062 (1, missing), ?UMMZ 213813 (9). Type catalog: Böhlke 1984:66 [ref. 13621] as holotype and paratypes; lectotype established by Fowler 1918:51, Pl. 13 [ref. 11665]. •Synonym of Cottus bairdii Girard 1850. Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

spinulosus, Cottus Kessler [K. F.] 1872:47 [3], Pl. 6 (figs. 1-2) [Izvestiia Imperatorskago Obschchestva Liubitelei Estestvozaniia, Antropologii i Etnografii v. 10 (no. 1); ref. 14134] Khodzhent [Leninabad], Syr Dayra River, Tajikistan. Non-types: ZIN 7870 (2, lost). On p. 3 of separate. •Valid as Cottus spinulosus Kessler 1872 -- (Berg 1949:1150 [ref. 20662], Goto et al. 2014:[11] [ref. 33456], Sideleva 2021:252 [ref. 38323]). Current status: Valid as Cottus spinulosus Kessler 1872. Cottidae. Distribution: Central Asia: Tajikistan, Uzbekistan, Kyrgyzstan and Kazakhstan. Habitat: freshwater.

spinulosus, Cottus Yashchenko [A. L.] 1896:67 [Trudy St.-Peterburgskogo Obscestva Estestvoispytatelej = Travaux de la Société des Naturalistes de St. Pétersbourg. v. 25 (no. 2); ref. 20230] Not available, no distinguishing features; perhaps refers to Cottus spinulosus Kessler 1872. Nomen Nudum. Cottidae.

subulatus, Abyssocottus gibbosus var. Dybowski [B. N.] 1908:552 [17], Fig. 12 [Kosmos Lwów v. 33; ref. 17422] Lake Baikal, Russia. Syntypes: whereabouts unknown. •Synonym of Abyssocottus gibbosus Berg 1906 -- (Berg 1949:1157 [ref. 20662]). •Valid as Abyssocottus subulatus (Dybowski 1908) -- (Bogdanov 2013:96 [ref. 37118]). Current status: Valid as Abyssocottus subulatus (Dybowski 1908). Cottidae. Distribution: Lake Baikal, Russia. Habitat: freshwater.

szanaga, Cottus Dybowski [B. N.] 1869:949, Pl. 14 (fig. 1) [Verhandlungen der K.-K. zoologisch-botanischen Gesellschaft in Wien v. 19; ref. 1169] Onon River and its tributaries, 51°42'N, 115°50'E, Amur River basin, Russia. Syntypes: ZMB 7107 (1). Type catalog: Paepke & Fricke 1992:284 [ref. 19946]. •Synonym of Cottus poecilopus Heckel 1837 -- (Berg 1949:1143 [ref. 20662] as czanaga, Fedorov in Whitehead et al. 1986:1248 [ref. 13677] as czanaga). •Valid as Cottus szanaga Dybowski 1869 -- (Shedko & Shedko 2003:330 [ref. 27966], Bogutskaya & Naseka 2004:188 [ref. 28183], Kottelat 2006:60 [ref. 28831], Ocock et al. 2006:57 [ref. 28933], Shedko & Miroshnichenko 2007:24 [ref. 29369], Bogutskaya et al. 2008:352 [ref. 30085], Sideleva & Goto 2009:603 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241 [ref. 33547], Parin et al. 2014:245 [ref. 33547], Dyldin & Orlov 2017:63 [ref. 35138], Dyldin et al. 2021:63 [ref. 38804]). Current status: Valid as Cottus szanaga Dybowski 1869. Cottidae. Distribution: North and East Asia: upper Amur River basin (China, Russia, Mongolia). Habitat: freshwater.

talievi, Batrachocottus Sideleva [V. G.] 1999:150 [204], Fig. 1 [Voprosy Ikhtiologii v. 39 (no. 2); ref. 24864] Lake Baikal, northern outlet of the Strait of Maloe More, depth 350-370 meters. Holotype: ZIN 13750 [radiograph no. 19614]. Paratypes: ZIN 51524/A (5). On p. 204 of English translation. •Valid as Batrachocottus talievi Sideleva 1999 -- (Bogutskaya et al. 2001:46 [ref. 26178], Sideleva 2001:58 [ref. 26181], Sideleva 2003:15, 159 [ref. 27815], Bogutskaya & Naseka 2004:197 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:115 [ref. 37569]). Current status: Valid as Batrachocottus talievi Sideleva 1999. Cottidae. Distribution: North Asia: Lake Baikal (Russia). Habitat: freshwater.

tallapoosae, Cottus Neely [D. A.], Williams [J. D.] & Mayden [R. L.] 2007:642, Figs. 1A, 2 [Copeia 2007 (no. 3); ref. 29262] 2 kilometers southwest of Red Hill, Gold Banch of Channahatchee Creek at County road 407, 32°40'17"N, 85°57'36"W, Elmore County, Alabama, USA. Holotype: UAIC 13545.03. Paratypes: Many lots at AUM, GMNH, TU, UAIC, UF, UT and USNM. Plus many non-type specimens mentioned in Material Examined. •Valid as Cottus tallapoosae Neely, Williams & Mayden 2007 -- (Scharpf 2008:11 [ref. 30399], Page & Burr 2011:477 [ref. 31215], Page et al. 2013:122 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus tallapoosae Neely, Williams & Mayden 2007. Cottidae. Distribution: Tallapoosa River drainage above the Fall Line in Alabama and Georgia, U.S.A. Habitat: freshwater.

tenuis, Uranidea Evermann [B. W.] & Meek [S. E.] 1898:83, Fig. 6 [Bulletin of the U. S. Fish Commission v. 17 (art. 2) [1897]; ref. 14683] Lower end of upper Klamath Lake near Klamath Falls, Oregon, U.S.A. Holotype: USNM 48229. Paratypes or non-types: ANSP 39142 (1, missing), BMNH 1900.9.29.198-199 (2), CAS-SU 5705 (20), USNM 124958 [ex BCF 434] (39). Type catalog: Böhlke 1953:133 [ref. 12291], Böhlke 1984:66 [ref. 13621]. •Valid as Cottus tenuis (Evermann & Meek 1898) -- (Lee et al. 1980:824 [ref. 22416], Page & Burr 1991:248 [ref. 18983], Nelson et al. 2004:119 [ref. 27807], Scharpf 2008:11 [ref. 30399], Page & Burr 2011:473 [ref. 31215], Page et al. 2013:123 [ref. 32708], Goto et al. 2014:[10] [ref. 33456]). Current status: Valid as Cottus tenuis (Evermann & Meek 1898). Cottidae. Distribution: Klamath River basin, Oregon, U.S.A. Habitat: freshwater.

thermalis, Neocottus Sideleva [V. G.] 2002:275, Fig. [Voprosy Ikhtiologii v. 42 (no. 2); ref. 26019] Lake Baikal, depth 430-480 meters. Holotype: ZIN 52196. Paratypes: USNM 360863 (1); ZIN 52197 (4 or 52), ?52219 (23). Sideleva 2001:69 [ref. 26181] indicates that the holotype is ZIN 52197 (52), paratype: ZIN 52219 (23). Appeared first without distinguishing features in Bogutskaya et al. 2001:47 [ref. 26178] and apparently also in Sideleva 2001:69 [ref. 26181]. •Valid as Neocottus thermalis Sideleva 2002 -- (Bogutskaya et al. 2001:47 [ref. 26178] [but not dating to this account], Sideleva 2003:19, 201 [ref. 27815], Bogutskaya & Naseka 2004:199 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Neocottus thermalis Sideleva 2002. Cottidae. Distribution: North Asia: Lake Baikal, local endemic of Frolikha Bay (Russia). Habitat: freshwater.

transsilvaniae, Cottus Freyhof [J.], Kottelat [M.] & Nolte [A.] 2005:157, Figs. 28-29 [Ichthyological Exploration of Freshwaters v. 16 (no. 2); ref. 28259] River Bratia at bridge on road 73c, about 20 kilometers southwest of village Cimpulung, 45°13'N, 24°47'E, Rumania. Holotype: ZMB 33596. Paratypes: FSFJ 686 (8). •Valid as Cottus transsilvaniae Freyhof, Kottelat & Nolte 2005 -- (Kottelat & Freyhof 2007:518 [ref. 29996], Sideleva 2009:211 [ref. 30173], Goto et al. 2014:[11] [ref. 33456], Sideleva et al. 2015:33 [ref. 35276], Sideleva et al. 2018:9 [ref. 36393]). Current status: Valid as Cottus transsilvaniae Freyhof, Kottelat & Nolte 2005. Cottidae. Distribution: Romania. Habitat: freshwater.

trigonocephalus, Cottus Gratzianov [V. I.] 1902:32 [Dnevnik' Zoologicheskogo Otdelenya Obshchestva Lyubiteley Estestvoznaniya, Antropologii i Etnografii, Moskva v. 3 (no. 3); ref. 1868] Ushkan Island, Lake Baikal, Russia, depth 280 feet (40 Russian fathoms). Holotype (unique): ZMMU P-3123. Type catalog: Vasil'eva et al. 2001:80 [ref. 25714]. •Synonym of Cottus kesslerii Dybowski 1874 -- (Berg 1949:1153 [ref. 20662] as kessleri, Sideleva 1982:27 [ref. 14469] as kessleri, Sideleva 1998:151 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 151 [ref. 27815], Kottelat 2006:60 [ref. 28831]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

tubulatus, Cottus Hubbs [C. L.] & Schultz [L. P.] 1932:2 [Occasional Papers of the Museum of Zoology University of Michigan No. 242; ref. 16378] A tributary to north fork of the Clearwater River, near Bovill, Idaho, U.S.A. Holotype: UMMZ 92342. Paratypes: UMMZ 92669 (2). •Synonym of Cottus beldingii Eigenmann & Eigenmann 1891 -- (Bailey & Bond 1963:1 [ref. 3934], Lee et al. 1980:806 [ref. 22416], Baxter & Stone 1995:223 [ref. 23374]). Current status: Synonym of Cottus beldingii Eigenmann & Eigenmann 1891. Cottidae. Habitat: freshwater.

uncinatus, Cottus Temminck [C. J.] & Schlegel [H.] 1843:38 [Fauna Japonica Parts 2-4; ref. 4371] Japan. Lectotype: RMNH 536a. Paralectotypes: RMNH 536b-c (2). Objectively invalid; preoccupied by Cottus uncinatus Reinhardt 1835. Lectotype selected by Boeseman 1947:48 [ref. 12876]. •Synonym of Trachidermus fasciatus Heckel 1837 -- (Okada 1961:709 [ref. 6363]). 1°Homonym. Current status: Synonym of Trachidermus fasciatus Heckel 1837. Cottidae. Habitat: brackish, marine.

uschkani, Batrachocottus Taliev [D. N.] 1955:51 et seq., 263, Figs. 56, 105 [ ref. 4316] Lake Baikal, Russia. Syntypes: none found at ZIN. Appeared without distinguishing features and unavailable in Taliev 1948:113 [ref. 19628] and spelled ushkani. •Synonym of Batrachocottus baicalensis (Dybowski 1874) -- (Sideleva 1982:28 [ref. 14469], Sideleva 1998:149 [ref. 23595], Sideleva 1999:149 [ref. 24864], Sideleva 2001:57 [ref. 26181], Sideleva 2003:15 [ref. 27815] dated 1948). Current status: Synonym of Batrachocottus baicalensis (Dybowski 1874). Cottidae. Habitat: freshwater.

ushkani, Batrachocottus Taliev [D. N.] 1948:113 [Trudy Baikal'skoi Limnologicheskoi Stantsii v. 12; ref. 19628] Not available, manuscript name mentioned in table. In the synonymy of Batrachocottus baicalensis (Dybowskii 1874). •Described in an available way as new in Taliev 1955:263 [ref. 6314] as Batrachocottus uschkani. Nomen Nudum. Current status: Synonym of Batrachocottus baicalensis (Dybowski 1874). Cottidae.

vietleri, Cottus Sauvage [H.-E.] (ex Dybowski) 1878:143 [Nouvelles Archives du Muséum d'Histoire Naturelle, Paris (Série 2) v. 1; ref. 3880] Lake Baikal, Russia. No types known. •Synonym of Paracottus (Leocottus) kesslerii (Dybowski 1874) -- (Taliev 1955:244 [ref. 4316]). •Synonym of Leocottus kesslerii (Dybowski 1874). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.

viscosus, Cottus Haldeman [S. S.] 1840:3 [Suppl. Monogr. Limnea. No. 3; ref. 21965] Susquehanna River, eastern Pennsylvania, U.S.A. No types known. Possible syntypes: MCZ 13614 (1). Original not seen; see Jordan & Evermann 1898:1968 [ref. 2444]. •Synonym of Cottus cognatus Richardson 1836 -- (Smith 1986:358 [ref. 22186]). Current status: Synonym of Cottus cognatus Richardson 1836. Cottidae. Habitat: freshwater, brackish.

volki, Cottus minutus Taranetz [A. Ya.] 1933:84 [2] [Doklady Akademii Nauk SSSR, Ser. A (Comptes Rendus de l'Académie des Sciences de l'URSS), Leningrad v. 2; ref. 16528] Suchan River to Takema River, western coast of the Sea of Japan, Primorye, Russia. Syntypes and/or Taranetz specimens: ZIN 25410 (1) Phusun R. On p. 1 of separate. •Synonym of Cottus poecilopus Heckel 1837, but a valid subspecies as described -- (Berg 1949:1144 [ref. 20662], Reshetnikov et al. 1997:758 [ref. 24702], Sideleva 1998:152 [ref. 23595], Parin et al. 2002:S73 [ref. 28300], Fujii et al. 2005:12 [ref. 28191]). •Synonym of Cottus poecilopus Heckel 1837 -- (Bogutskaya et al. 2001:46 [ref. 26178]). •Valid as Cottus volki Taranetz 1933 -- (Shedko & Shedko 2003:330 [ref. 27966], Bogutskaya & Naseka 2004:188 [ref. 28183], Shedko & Miroshnichenko 2007:24 [ref. 29369], Sideleva & Goto 2009:610 [ref. 30591], Goto et al. 2014:[9] [ref. 33456], Parin et al. 2014:241, 245 [ref. 33547]). Current status: Valid as Cottus volki Taranetz 1933. Cottidae. Distribution: Sea of Japan. Habitat: freshwater, brackish.

werestschagini, Abyssocottus Taliev [D. N.] 1935:59, Pl. 1 (fig. 3) [Trudy Baikal'skoi limnologischeskoi stantsii = Travaux de la Station limnologique du Lac Baikal v. 6; ref. 15741] Off Listvenichnoe, southern Lake Baikal, Russia, depth 877 meters. Syntypes: (5) not at ZIN. Neotype designation [without a number] if first in Sideleva 2001:69 [ref. 26181] is invalid, not in compliance with the Code. Numbered ZIN 46662 in Sideleva 2003:200 [ref. 27815] but still invalid. •Valid as Abyssocottus werestschagini Taliev 1935 -- (Berg 1949:1158 [ref. 20662]). •Valid as Cottinella werestschagini (Taliev 1935) -- (Taliev 1955:344 [ref. 4316]). •Valid as Neocottus werestschagini (Taliev 1935) -- (Sideleva 1982:31 [ref. 14469], Reshetnikov et al. 1997:760 [ref. 24702], Sideleva 1998:158 [ref. 23595], Bogutskaya et al. 2001:47 [ref. 26178], Sideleva 2002:275 [ref. 26019], Sideleva 2003:18, 200 [ref. 27815], Bogutskaya & Naseka 2004:199 [ref. 28183], Goto et al. 2014:[15] [ref. 33456], Dyldin et al. 2020:116 [ref. 37569]). Current status: Valid as Neocottus werestschagini (Taliev 1935). Cottidae. Distribution: North Asia: southern part of Lake Baikal (Russia). Habitat: freshwater.

wheeleri, Uranidea Cope [E. D.] 1874:138 [10] [Proceedings of the American Philosophical Society v. 14; ref. 932] Beaver River, southwestern Utah, U.S.A. Syntypes: ANSP 22951 (1); MCZ 13636 (2); USNM 12905 (5), 16973 (5). Type catalog: Böhlke 1984:66 [ref. 13621]. On p. 10 of separate. •Synonym of Cottus bairdii Girard 1850, subspecies semiscaber (Cope 1872) -- (La Rivers 1994:586 [ref. 23389]). Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

wilsonii, Cottus Girard [C. F.] 1851:42, Pl. 1 (figs. 3-4) [Smithsonian Contributions to Knowledge v. 3 (art. 3) (for 1850); ref. 18124] Allegheny River, Foxburg, Pennsylvania, U.S.A. Syntypes: ANSP, USNM. •Synonym of Cottus bairdii Girard 1850. Current status: Synonym of Cottus bairdii Girard 1850. Cottidae. Habitat: freshwater.

zopherus, Potamocottus Jordan [D. S.] 1877:320 [Annals of the Lyceum of Natural History of New York v. 11 (nos 11-12) (art. 29); ref. 2373] Small tributaries of the Etowah and Oostanaula rivers near Rome, Georgia, U.S.A. Syntypes: BMNH 1880.1.21.18 (1); MCZ 24377 (1); MNHN A-1295 (1); USNM 17877 (7), 329282 [ex Butler Univ. 379] (6). Type catalog: Blanc & Hureau 1968:54 [ref. 20738]. •Synonym of Cottus carolinae (Gill 1861) -- (Lee et al. 1980:807 [ref. 22416], Robison & Buchanan 1988:476 [ref. 23393]). •Synonym of Cottus carolinae (Gill 1861), but a valid subspecies as described -- (Boschung & Mayden 2004:424 [ref. 27995], Scharpf 2008:8 [ref. 30399], Page & Burr 2011:470 [ref. 31215]). Current status: Synonym of Cottus carolinae (Gill 1861). Cottidae. Distribution: Southeastern U.S.A.: Alabama and Georgia [subspecies zopherus]. Habitat: freshwater.