Please look in Eschmeyer's Catalog of Fishes for authorships of sections, Families of Fishes (all), and related information.

Species in the family or subfamily Akysidae: [ 68 ] records

alfredi, Akysis Ng [H. H.] & Kottelat [M.] 1998:1063, Figs. 4a, 5, 13a, 7 [Journal of Natural History v. 32 (no. 7); ref. 23903] Tasek Bera, about 300 meters east of Fort Iskandar, Pahang, Malaysia. Holotype: ZRC 40714. Paratypes: CMK 13026 (3); UMMZ 233004 (2); ZRC 20755-57 (3), 40715 (17). Type catalog: Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:5 [ref. 29920]. •Valid as Akysis alfredi Ng & Kottelat 1998 -- (Ng & Tan 1999:362 [ref. 24159], Ng & Siebert 2004:5 [ref. 27936], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius alfredi (Ng & Kottelat 1998) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:328 [ref. 38407], Ahmad et al. 2023:107 [ref. 41243]). Current status: Valid as Pseudobagarius alfredi (Ng & Kottelat 1998). Akysidae: Akysinae. Distribution: Southeast Asia: Malaya (Malaysia). IUCN (2019): Data Deficient. Habitat: freshwater.

anomalopteryx, Parakysis Roberts [T. R.] 1989:142 [Memoirs of the California Academy of Sciences No. 14; ref. 6439] Kapuas basin, Sungai Seriang, a forested tributary of the Sungai Palin, 37 kilometers west of Putussibau, Borneo, Indonesia. Holotype: MZB 3702. Paratypes: (36) AMNH 48940 (2); BMNH 1982.3.29.151-52 (2); CAS 49420 (6), 49421 (5, c&s); FMNH 94245 (2); MCZ 58352 (2); MNHN 1982-0714 (2); MZB 3701, 3703; UMMZ 209923; USNM 230307 (5). Type catalog: Ferraris & Vari 1992:32 [ref. 19771], Ferraris 2007:15 [ref. 29155]. •Valid as Parakysis anomalopteryx Roberts 1989 -- (Kottelat et al. 1993:76 [ref. 23448], Ng & Lim 1995:259 [ref. 21887], Burgess & Finley 1996:165 [ref. 22901], Ng & Kottelat 2003:48 [ref. 26707], Kottelat & Widjanarti 2005:163 [ref. 28284], Ferraris 2007:15 [ref. 29155], Ng 2009:39 [ref. 30102], Kottelat 2013:219 [ref. 32989]). Current status: Valid as Parakysis anomalopteryx Roberts 1989. Akysidae: Parakysinae. Distribution: Kapuas River basin, western Borneo, Indonesia. Habitat: freshwater.

baramensis, Akysis Fowler [H. W.] 1905:472, Fig. 4 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 57; ref. 1370] Baram River, Sarawak state, Borneo, East Malaysia. Holotype: ANSP 114887 [ex WIAP 14149]. Paratypes: (25) ANSP 88950 (19), CAS 54503 [ex WIAP 14195] (3, 2 c&s are missing). Type catalog: Böhlke 1984:18 [ref. 13621], Ferraris 2007:16 [ref. 29155]. Burgess 1989:132 [ref. 12860] has the species in Glyptothorax (Sisoridae). •Valid as Akysis baramensis Fowler 1905 -- (Roberts 1989:134 [ref. 6439], Kottelat et al. 1993:75 [ref. 23448], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Kottelat & Lim 1996:241 [ref. 23210], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Siebert 2004:5 [ref. 27936], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius baramensis (Fowler 1905) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:328 [ref. 38407]). Current status: Valid as Pseudobagarius baramensis (Fowler 1905). Akysidae: Akysinae. Distribution: Baram River basin, Borneo, Malaysia. Habitat: freshwater.

bilustris, Akysis Ng [H. H.] 2011:62, Fig. 1 [Zootaxa No. 3066; ref. 31572] Xe Kong where Houai Tamopat enters it, downstream of Ban Khanmaknao, 14°36'31"N, 106°33' 08"E, Attapeu Province, Laos. Holotype: ZRC 53111. Paratypes: CMK 15692 (1), 21247 (1), 21411 (2), 21457 (1); ZRC 53112 (2). •Valid as Akysis bilustris Ng 2011 -- (Kottelat 2013:218 [ref. 32989], Taki et al. 2021:299 [ref. 39830]). Current status: Valid as Akysis bilustris Ng 2011. Akysidae: Akysinae. Distribution: Southeast Asia: Mekong River basin, southern Laos and Cambodia. Habitat: freshwater.

brachybarbatus, Akysis Chen [Y.-R.] in He & Chen 1981:210 (English p. 213), Fig. 2 [Zoological Research v. 2 (no. 3); ref. 21313] Nanrui River, Mekong River system, Menlian County, China. Holotype: KIZ 787162. Paratypes: KIZ (26). Type catalog: Ferraris 2007:13 [ref. 29155], Du et al. 2013:354 [ref. 32939] with author as He. •Valid as Akysis brachybarbatus Chen 1981 -- (Zhu 1995:158 [ref. 25213], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1059 [ref. 23903], Yue & Chen 1998:224 [ref. 26415], Ng & Tan 1999:362 [ref. 24159], Chen in Chu et al. 1999:112 [ref. 24534], Ng & Kottelat 2000:9 [ref. 25042], Ng & Freyhof 2003:315 [ref. 27399], Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Page et al. 2007:292 [ref. 29140], Ferraris 2007:13 [ref. 29155], Ng 2007:53 [ref. 29306], Ng 2008:260 [ref. 29979], Ng 2009:7 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Zhang et al. 2016:170 [ref. 34477], Fu et al. 2021:9572 [ref. 39347], Ng et al. 2022:7 [ref. 39344]). Current status: Valid as Akysis brachybarbatus Chen 1981. Akysidae: Akysinae. Distribution: Southeast Asia: Lancangjiang [Mekong] River, Yunnan (China). Habitat: freshwater.

buettikoferi, Acrochordonichthys Popta [C. M. L.] 1904:188 [Notes from the Leyden Museum v. 24 (no. 4) (art. 6) (for Oct. 1902); ref. 3547] Bongan River of Kapuas basin and Bo River of Mahakam basin, Borneo, Indonesia. Syntypes: RMNH 7557 Bongan River (1), 7558 (2) Bo River. Type catalog: Ferraris 2007:13 [ref. 29155]. Originally as büttikoferi. •Questionably a synonym of Acrochordonichthys melanogaster (Bleeker 1854) -- (Roberts 1989:138 [ref. 6439]). •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:412 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

cessator, Breitensteinia Ng [H. H.] & Siebert [D. J.] 1998:647, Figs. 1, 4b, 5b [Journal of Fish Biology v. 53 (no. 3); ref. 24172] Kapuas River near Sebruang, Borneo, Indonesia (0°25.5'N, 111°52.5'E). Holotype: MZB 3693. Paratypes: CAS 49415 (2), CMK 6035 (1), RMNH 7847 (1), USNM 230304 (1), ZMA 104.653 (1). Type catalog: Ferraris 2007:15 [ref. 29155]. •Valid as Breitensteinia cessator Ng & Siebert 1998 -- (Tan & Ng 1999:290 [ref. 24254], Kottelat & Widjanarti 2005:163 [ref. 28284], Ferraris 2007:15 [ref. 29155], Kottelat 2013:219 [ref. 32989]). Current status: Valid as Breitensteinia cessator Ng & Siebert 1998. Akysidae: Parakysinae. Distribution: Western Borneo, Indonesia. Habitat: freshwater.

chamaeleon, Sosia Vaillant [L. L.] 1902:82, Figs. 19-21 [Notes from the Leyden Museum v. 24 (note 1); ref. 4490] Raun River, Kalimantan Barat, Borneo, Indonesia. Lectotype: RMNH 7849. Paralectotypes: MNHN 1903-0190 [ex RMNH] (1) Kapuas basin; RMNH 7848 (2), 7850 (1), 7851 (3). Type catalog: Bertin & Estève 1950:32 [ref. 19575], Ferraris 2007:12 [ref. 29155]. Lectotype selected by Ng & Ng 2001:406 [ref. 25771]. •Valid as Acrochordonichthys chamaeleon (Vaillant 1902) -- (Roberts 1989:137 [ref. 6439], Kottelat et al. 1993:74 [ref. 23448], Ng & Rachmatika 1999:169 [ref. 23964], Ng & Ng 2001:404 [ref. 25771], Kottelat & Widjanarti 2005:162 [ref. 28284], Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys chamaeleon (Vaillant 1902). Akysidae: Parakysinae. Distribution: Western Borneo, Indonesia. Habitat: freshwater.

clavulus, Akysis Ng [H. H.] & Freyhof [J.] 2003:312, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 14 (no. 4); ref. 27399] Song Duc My about 10 kilometers west of Ninh Hoa, 12°32.22'N, 109°01.38'E, Khanh Hoa Province, Vietnam. Holotype: ZFMK 27159. Paratypes: UMMZ 238018 (1); ZFMK 23265 (1), 25506-16 (11), 27156-58 (3), 27160-65 (6), 27506-09 (4); ZRC 46177 (3). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:5 [ref. 29920], Herder et al. 2010:119 [ref. 31087]. •Valid as Akysis clavulus Ng & Freyhof 2003 -- (Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:7 [ref. 39344]). Current status: Valid as Akysis clavulus Ng & Freyhof 2003. Akysidae: Akysinae. Distribution: Cai and Duc My rivers, draining to the central coast of Vietnam. Habitat: freshwater.

clinatus, Akysis Ng [H. H.] & Rainboth [W. J.] 2005:34, Figs. 1, 3a [Raffles Bulletin of Zoology Suppl. no. 13; ref. 28353] Stung Chhay River, Tok Kong village on road from Phnom Penh to Sihanoukville, 10°56'37.8"N, 113°47'47.4"E, Cambodia. Holotype: ZRC 47288. Paratypes: ZRC 46159 (3). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:5 [ref. 29920]. •Valid as Akysis clinatus Ng & Rainboth 2005 -- (Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2009:48 [ref. 30100], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:7 [ref. 39344]). Current status: Valid as Akysis clinatus Ng & Rainboth 2005. Akysidae: Akysinae. Distribution: Cambodia. Habitat: freshwater.

ephippifer, Akysis Ng [H. H.] & Kottelat [M.] 1998:1078, Figs. 4h, 11, 13f [Journal of Natural History v. 32 (no. 7); ref. 23903] Stung Santréa, 40 kilometers from Pomnac, Cambodia. Holotype: MNHN 1977-0034. Paratypes: MNHN 1997-0035 to 0038 (5, 6, 5, 3); CMK 4296 (1, c&s), 11936 (6), 11938 (3); ZRC 40713 (6). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:7 [ref. 29920]. •Valid as Akysis ephippifer Ng & Kottelat 1998 -- (Ng & Tan 1999:362 [ref. 24159], Kottelat 2001:138 [ref. 25780] = bilustris, Ng & Freyhof 2003:315 [ref. 27399], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Taki et al. 2021:299 [ref. 39830], Ng et al. 2022:7 [ref. 39344]). Current status: Valid as Akysis ephippifer Ng & Kottelat 1998. Akysidae: Akysinae. Distribution: Southeast Asia: lower Mekong River basin, Cambodia. Habitat: freshwater.

eustictus, Pseudobagarius Ng [H. H.] & Kottelat [M.] 2021:323, Figs. 1, 2, 5a [Zootaxa 4996 (no. 2); ref. 38407] Keng Ban Veun rapids at Ban Mouang Mor, 1.5 km downstream of bridge about 7 km S of Kenethao, Nam Heung, Xayaburi Province, Laos, 17°40'59"N, 101°24'03"E, elevation 242 meters. Holotype (unique): MHNG 2786.062. •Valid as Pseudobagarius eustictus Ng & Kottelat 2021. Current status: Valid as Pseudobagarius eustictus Ng & Kottelat 2021. Akysidae: Akysinae. Distribution: Southeast Asia: Nam Heung, Mekong River basin, Laos. Habitat: freshwater.

falcifer, Acrochordonichthys Ng [H. H.] & Ng [P. K. L.] 2001:408, Figs. 5a, 6g, 16 [Journal of Fish Biology v. 58 (no. 2); ref. 25771] Sungai Segama, Sabah, Borneo, Malaysia. Holotype: ZRC 43321. Paratypes: FMNH 68008 (1); SSM uncat. (2); 68009 (4); ZRC 43322-24 (1, 2, 1). Type catalog: Ferraris 2007:12 [ref. 29155], Ng & Kim 2008:4 [ref. 29920]. •Valid as Acrochordonichthys falcifer Ng & Ng 2001 -- (Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys falcifer Ng & Ng 2001. Akysidae: Parakysinae. Distribution: Northeastern Borneo, Malaysia. Habitat: freshwater.

filifer, Akysis Ng [H. H.] & Rainboth [W. J.] 2005:37, Figs. 5-7 [Raffles Bulletin of Zoology Suppl. no. 13; ref. 28353] Kandal, Tonle Sap, fishing lot 8, 22 miles upstream from Phnom Penh, 11°44'N, 104°50'E, Cambodia. Holotype (unique): UMMZ 235728. Type catalog: Ferraris 2007:16 [ref. 29155]. •Valid as Akysis filifer Ng & Rainboth 2005. •Valid as Pseudobagarius filifer (Ng & Rainboth 2005) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:328 [ref. 38407], Taki et al. 2021:297 [ref. 39830]). Current status: Valid as Pseudobagarius filifer (Ng & Rainboth 2005). Akysidae: Akysinae. Distribution: Southeast Asia: Mekong River basin, Cambodia and Vietnam. Habitat: freshwater.

fontaneus, Akysis Ng [H. H.] 2009:42, Figs. 1-2, 5a, 6a [Zootaxa No. 1973; ref. 30100] Sungai Jernih at Desa Jerih, ca. 25 killometers on road to Sarolangun after turnoff at Paihm 2°00.215'S, 102°42.475'E, Jambi, Sumatra. Holotype (unique): MZB 10989. •Valid as Akysis fontaneus Ng 2009 -- (Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989]). Current status: Valid as Akysis fontaneus Ng 2009. Akysidae: Akysinae. Distribution: Central Sumatra. Habitat: freshwater.

fuliginatus, Akysis Ng [H. H.] & Rainboth [W. J.] 2005:35, Fig. 4 [Raffles Bulletin of Zoology Suppl. no. 13; ref. 28353] Stung Treng Province, Mekong River on western edge of Kaoh Han, 16 kilometers northeast of Stung Treng, 13°38'N, 106°03'E, Cambodia. Holotype: UMMZ 241338. Type catalog: Ferraris 2007:14 [ref. 29155]. •Valid as Akysis fuliginatus Ng & Rainboth 2005 -- (Ng 2006:20 [ref. 28586], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2007:53 [ref. 29306], Ng 2009:7 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis fuliginatus Ng & Rainboth 2005. Akysidae: Akysinae. Distribution: Lower Mekong River basin, Cambodia. Habitat: freshwater.

fuscus, Akysis Ng [H. H.] & Kottelat [M.] 1996:20, Fig. 1 [Ichthyological Exploration of Freshwaters v. 7 (no. 1); ref. 22212] Kalimantan Barat, Danau Sentarum area, Sungai Hulu Leboyan at Keluwin, Borneo. Holotype: MZB 5934. Paratypes: CMK 11712 (8), MZB 5935 (3), ZRC 38840 (4). Type catalog: Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:8 [ref. 29920]. •Valid as Akysis fuscus Ng & Kottelat 1996 -- (Burgess & Finley 1996:165 [ref. 22901], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Rachmatika 1999:171 [ref. 23964], Ng & Tan 1999:362 [ref. 24159], Ng & Siebert 2004:5 [ref. 27936], Ng & Rainboth 2005:33 [ref. 28353] with author as Ng, Kottelat & Widjanarti 2005:162 [ref. 28284]). •Valid as Pseudobagarius fuscus (Ng & Kottelat 1996) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:328 [ref. 38407]). Current status: Valid as Pseudobagarius fuscus (Ng & Kottelat 1996). Akysidae: Akysinae. Distribution: Sarawak, Borneo, Indonesia. Habitat: freshwater.

galeatus, Akysis Page [L. M.], Rachmatika [I.] & Robins [R. H.] in Page, Hadiaty, López, Rachmatika & Robins 2007:299, Figs. 3 (left column), 6 [Copeia 2007 (no. 2); ref. 29140] Way Gedongwani (Way Sekampung drainage), 5°14.499'S, 105°29.060'E, Lampung, Sumatra, Indonesia. Holotype: MZB 15192. Paratypes: ANSP 182914 (1), INHS 100121 (1), MZB 15193 (2), UF 162466 (2). •Valid as Akysis galeatus Page, Rachmatika & Robins 2007 -- (Ng 2008:260 [ref. 29979], Ng 2009:46 [ref. 30100], Ng 2011:66 [ref. 31572], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis galeatus Page, Rachmatika & Robins 2007. Akysidae: Akysinae. Distribution: Lampung Province, Sumatra, Indonesia. Habitat: freshwater.

grandis, Parakysis Ng [H. H.] & Lim [K. K. P.] 1995:260, Fig. 7 [Ichthyological Exploration of Freshwaters v. 6 (no. 3); ref. 21887] Small stream with grassy banks near Pangkalankasai, 43 kilometers south of Rengat, Riau Province, Sumatra, Indonesia. Holotype: ZRC 39111a. Paratypes: BMNH 1908.7.13.9-10 (2); CMK 7225 (11), 9032 (5), 11192 (3); CAS-SU 33011 (3); ZRC 31458 (2), 38632 (3), 39111b (2), 39178 (1). Type catalog: Ferraris 2007:15 [ref. 29155], Ng & Kim 2008:16 [ref. 29920]. •Valid as Parakysis grandis Ng & Lim 1995 -- (Burgess & Finley 1996:165 [ref. 22901], Tan & Ng 1999:290 [ref. 24254], Ng & Kottelat 2003:48 [ref. 26707], Ferraris 2007:15 [ref. 29155], Ng 2009:39 [ref. 30102], Kottelat 2013:220 [ref. 32989]). Current status: Valid as Parakysis grandis Ng & Lim 1995. Akysidae: Parakysinae. Distribution: Borneo and Sumatra. Habitat: freshwater.

guttatus, Acrochordonichthys Ng [H. H.] & Ng [P. K. L.] 2001:394, Figs. 6-8, 10 [Journal of Fish Biology v. 58 (no. 2); ref. 25771] Barito River drainage, Sungai Barito at Muara Laung, Kalimantan Tengah, Borneo, Indonesia. Holotype: MZB 9301. Paratypes: BMNH 1997.7.17.2 (1), 1997.7.17.8 (1), 1997.7.17.9-13 (6);CMK 11847 (1);MZB 7024 (1), 8187 (1); MZUSP 42468 (2); ZRC 41966 (2). Type catalog: Ferraris 2007:12 [ref. 29155], Ng & Kim 2008:5 [ref. 29920]. •Valid as Acrochordonichthys guttatus Ng & Ng 2001 -- (Vidthayanon & Ng 2003:6 [ref. 27425], Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys guttatus Ng & Ng 2001. Akysidae: Parakysinae. Distribution: Southern Borneo, Indonesia. Habitat: freshwater.

gyrinus, Acrochordonichthys Vidthayanon [C.] & Ng [H. H.] 2003:2, Figs. 1, 2a [Zootaxa No. 183; ref. 27425] Yom River at Prompiram, Phitsanulok Province, Thailand. Holotype: NIFI 2645. Paratypes: NIFI 3133 (2), UMMZ 240152 (1). Type catalog: Ferraris 2007:12 [ref. 29155]. •Valid as Acrochordonichthys gyrinus Vidthayanon & Ng 2003 -- (Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys gyrinus Vidthayanon & Ng 2003. Akysidae: Parakysinae. Distribution: Chao Phraya basin, Thailand. Habitat: freshwater.

hardmani, Akysis Ng [H. H.] & Sabaj Pérez [M. H.] 2005:218, Figs 3, 4a, 5a [Ichthyological Exploration of Freshwaters v. 16 (no. 3); ref. 28330] Mae Nam Chao Phraya and tributaries in vicinity of Phayuha Khiri, Nakhon Sawan, Thailand. Holotype: ANSP 178858. Paratypes: INHS 93561 (1), 93713 (3); KUMF 3193 (1). Type catalog: Ferraris 2007:16 [ref. 29155] •Valid as Akysis hardmani Ng & Sabaj Pérez 2005. •Valid as Pseudobagarius hardmani (Ng & Sabaj Pérez 2005) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:328 [ref. 38407]). Current status: Valid as Pseudobagarius hardmani (Ng & Sabaj Pérez 2005). Akysidae: Akysinae. Distribution: Chao Phraya River basin, Thailand. Habitat: freshwater.

hendricksoni, Akysis Alfred [E. R.] 1966:467, Fig. 1 [Copeia 1966 (no. 3); ref. 8002] Trengganu River at Kuala Brang, Trengganu, Malaysia. Holotype: ZRC 1414. Paratypes: BMNH 1966.2.11.1 (1), ZRC 1416 (1). Type catalog: Alfred 1970:69 [ref. 23931], Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:8 [ref. 29920]. •Valid as Akysis hendricksoni Alfred 1966 -- (He & Chen 1981:212 [ref. 21313], Burgess 1989:118 [ref. 12860], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1084 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng 1999:547 [ref. 24609], Ng & Freyhof 2003:315 [ref. 27399], Ng & Kottelat 2004:199 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:8 [ref. 39344], Ahmad et al. 2023:105 [ref. 41243]). Current status: Valid as Akysis hendricksoni Alfred 1966. Akysidae: Akysinae. Distribution: Southeast Asia: Malaya (Malaysia) and Isthmus of Kra (southern Thailand). IUCN (2019): Least Concern. Habitat: freshwater.

heterurus, Akysis Ng [H. H.] 1996:4, Figs. 1-2 [Raffles Bulletin of Zoology v. 44 (no. 1); ref. 22484] Sg. Alai at 19.5 kilometers Muara Bung-Muara Tebo road, Jambi, Sumatra, Indonesia. Holotype: ZRC 34194. Paratypes: CMK 12199 (1); MZB 6209 (1); ZRC 39248 (7). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:9 [ref. 29920]. •Valid as Akysis heterurus Ng 1996 -- (Burgess & Finley 1996:165 [ref. 22901], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng 1999:547 [ref. 24609], Tan & Ng 1999:289 [ref. 24254], Ng & Freyhof 2003:315 [ref. 27399], Ng & Kottelat 2004:199 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2009:46 [ref. 30100], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis heterurus Ng 1996. Akysidae: Akysinae. Distribution: Sumatra, Indonesia. Habitat: freshwater.

hypselurus, Breitensteinia Ng [H. H.] & Siebert [D. J.] 1998:650, Figs. 3, 4a, 5a [Journal of Fish Biology v. 53 (no. 3); ref. 24172] Sanggau, Borneo. Holotype (unique): RMNH 16048. Type catalog: Ferraris 2007:15 [ref. 29155]. •Valid as Breitensteinia hypselurus Ng & Siebert 1998 -- (Ferraris 2007:15 [ref. 29155], Kottelat 2013:219 [ref. 32989]). Current status: Valid as Breitensteinia hypselurus Ng & Siebert 1998. Akysidae: Parakysinae. Distribution: Kapuas River basin, Borneo, Indonesia. Habitat: freshwater.

hystriculus, Parakysis Ng [H. H.] 2009:40, Figs. 1, 2a, 4a, 5a, 6a, [Zootaxa No. 1977; ref. 30102] Swamp forest at Sentang, ca. 5 kilometers after turnoff ca. 12 kilometers after Bayung Lencir on Bayung Lencir-Jambi road, 1°56.192'S, 103°41.532'E, Lalang drainage, Sumatera Selatan, Sumatra. Holotype: MZB 10985. Paratypes: CMK 29676 (10), MZB 10986 (10), UMMZ 248763 (12), ZRC 43088 (68). •Valid as Parakysis hystriculus Ng 2009 -- (Kottelat 2013:220 [ref. 32989]). Current status: Valid as Parakysis hystriculus Ng 2009. Akysidae: Parakysinae. Distribution: Lalang River drainage, southern Sumatra. Habitat: freshwater.

inermis, Akysis Ng [H. H.] & Kottelat [M.] 2000:8, Figs. 1, 2a [Journal of South Asian Natural History v. 5 (no. 1); ref. 25042] Unnamed creek entering Xe Kaman from the north at proposed Xe Kaman dam site, Attapeu Province, Laos, 14°57'40"N, 107°09'16"E. Holotype: ZRC 45401. Paratypes: CMK 13614 (1), 15619 (8); LARRI uncat. (3); ZRC 45402 (3). Type catalog: Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:10 [ref. 29920]. •Valid as Akysis inermis Ng & Kottelat 2000 -- (Kottelat 2001:140 [ref. 25780], Ng & Rainboth 2005:33 [ref. 28353], Kottelat 2015:47 [ref. 33971]). •Valid as Pseudobagarius inermis (Ng & Kottelat 2000) -- (Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407], Taki et al. 2021:296 [ref. 39830]). Current status: Valid as Pseudobagarius inermis (Ng & Kottelat 2000). Akysidae: Akysinae. Distribution: Southeast Asia: Mekong River basin, Laos and northern and western Cambodia. Habitat: freshwater.

insignis, Breitensteinia Steindachner [F.] 1881:46 [Anzeiger der Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Klasse v. 18 (no. 6) (for 17 Feb. 1881); ref. 20483] Teweh [= Moara Teweh], Barito River, southeastern Borneo, Indonesia. Holotype (unique): NMW 55042. Type catalog: Ferraris 2007:15 [ref. 29155]. Species later described in more detail in Steindachner 1881:213 [p. 35 in separate] [ref. 4231], and illustrated in Pl. 1 (fig. 2) in Steindachner 1881 [ref. 4232]. •Valid as Breitensteinia insignis Steindachner 1881 -- (Roberts 1989:140 [ref. 6439], Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:75 [ref. 23448], Ng & Siebert 1998:653 [ref. 24172], Ferraris 2007:15 [ref. 29155], Kottelat 2013:219 [ref. 32989]). Current status: Valid as Breitensteinia insignis Steindachner 1881. Akysidae: Parakysinae. Distribution: Borneo, Indonesia. Habitat: freshwater.

ischnosoma, Acrochordonichthys Bleeker [P.] 1858:232 [Acta Societatis Regiae Scientiarum Indo-Neêrlandicae v. 4 (art. 2); ref. 365] Tjitarum [Citarum] River, Parongkalong, Preanger Province, Java, Indonesia. Holotype (unique): BMNH 1863.12.11.151 [? 1863.12.4.151]. Type catalog: Ferraris 2007:12 [ref. 29155]. Illustrated as Silur. Pl. 36 (fig. 4 not 3) [cumulative Pl. 84], published in Bleeker 1863 [ref. 393]. See van Oijen et al. 2009:203 [ref. 30423]. •Valid as Acrochordonichthys ischnosoma Bleeker 1858 -- (Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:74 [ref. 23448], Ng & Ng 2001:392 [ref. 25771], Ng & Tan 2002:449 [ref. 26896], Vidthayanon & Ng 2003:6 [ref. 27425], Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys ischnosoma Bleeker 1858. Akysidae: Parakysinae. Distribution: Java and Sumatra. Habitat: freshwater.

leucorhynchus, Akysis Fowler [H. W.] 1934:97, Figs. 44-45 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 86; ref. 1417] Chieng Mai, northern Thailand. Holotype: ANSP 59346. Paratypes: ANSP 59347-48 (1, 1). Additional material (7). Type catalog: Böhlke 1984:18 [ref. 13621], Ferraris 2007:16 [ref. 29155]. •Valid as Akysis leucorhynchus Fowler 1934 -- (He & Chen 1981:212 [ref. 21313], Burgess 1989:118 [ref. 12860], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1070 [ref. 23903], Ng & Kottelat 2000:9 [ref. 25042], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius leucorhynchus (Fowler 1934) -- (Ferraris 2007:16 [ref. 29155], Ng 2007:56 [ref. 29306], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius leucorhynchus (Fowler 1934). Akysidae: Akysinae. Distribution: Peninsular Thailand. Habitat: freshwater.

longifilis, Akysis Ng [H. H.] 2006:20, Fig. 1 [Zootaxa No. 1150; ref. 28586] Bago division Pyu township, Pyu stream, tributary of Sittang River, about 229 kilometers from Yangon, 18°29'N, 96°26'E, Myanmar. Holotype: UMMZ 246172. Paratypes: UF 161587 (2); UMMZ 245966 (7). Plus non-type material. •Valid as Akysis longifilis Ng 2006 -- (Page et al. 2007:292 [ref. 29140], Ng 2007:53 [ref. 29306], Ng 2008:260 [ref. 29979], Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis longifilis Ng 2006. Akysidae: Akysinae. Distribution: Sittang River drainage, southern Myanmar. Habitat: freshwater.

longirostris, Parakysis Ng [H. H.] & Lim [K. K. P.] 1995:262, Fig. 8 [Ichthyological Exploration of Freshwaters v. 6 (no. 3); ref. 21887] Nee Soon swamp forest, Singapore. Holotype: ZRC 34491. Paratypes: CMK 6033 (1); ZRC 10003-06 (4), 12163-67 (5), 23031-33 (3), 34492-97 (6), 37733 (2), 38249 (1). Type catalog: Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:17 [ref. 29920]. •Valid as Parakysis longirostris Ng & Lim 1995 -- (Burgess & Finley 1996:165 [ref. 22901], Ng & Tan 1999:362 [ref. 24159], Ng & Kottelat 2003:48 [ref. 26707], Ferraris 2007:16 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ahmad et al. 2023:106 [ref. 41243]). Current status: Valid as Parakysis longirostris Ng & Lim 1995. Akysidae: Parakysinae. Distribution: Southeast Asia: Malaya (Malaysia), Singapore and Riau Archipelago (Indonesia). IUCN (2019): Least Concern. Habitat: freshwater.

macronema, Akysis Bleeker [P.] 1860:11 [Acta Societatis Regiae Scientiarum Indo-Neêrlandicae v. 8 (art. 3); ref. 376] Lahat, Palembang Province, Sumatra, Indonesia. Syntypes: (4) BMNH 1863.12.4.188 (1), RMNH 6729 (2). Type catalog: Ferraris 2007:16 [ref. 29155]. •Valid as Akysis macronema Bleeker 1860 -- (He & Chen 1981:212 [ref. 21313], Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:75 [ref. 23448], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Rainboth 1996:159 [ref. 22772], Ng & Kottelat 1998:1059 [ref. 23903], Tan & Ng 1999:289 [ref. 24254], Ng & Kottelat 2000:9 [ref. 25042], Ng & Siebert 2004:5 [ref. 27936], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius macronema (Bleeker 1860) -- (Ferraris 2007:16 [ref. 29155] as macronemus, Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius macronema (Bleeker 1860). Akysidae: Akysinae. Distribution: Sumatra, Indonesia. Habitat: freshwater.

maculipinnis, Akysis Fowler [H. W.] 1934:97, Fig. 46 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 86; ref. 1417] Chantaboon [Chantaburi], southeastern Thailand. Holotype: ANSP 59366. Paratypes: ANSP 59367-72 (6). Type catalog: Böhlke 1984:18 [ref. 13621], Ferraris 2007:14 [ref. 29155] •Valid as Akysis maculipinnis Fowler 1934 -- (He & Chen 1981:212 [ref. 21313], Burgess 1989:118 [ref. 12860], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Rainboth 1996:159 [ref. 22772], Ng & Kottelat 1998:1088 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis maculipinnis Fowler 1934. Akysidae: Akysinae. Distribution: Southeastern Thailand and southwestern Cambodia. Habitat: freshwater.

mahakamensis, Acrochordonichthys Ng [H. H.] & Ng [P. K. L.] 2001:400, Figs. 6-7, 11 [Journal of Fish Biology v. 58 (no. 2); ref. 25771] Mahakam River, boulders upstream of Melak, 0°12'S, 115°47'E, Kalimantan Timur, Borneo, Indonesia. Holotype (unique): MZB 5952. Type catalog: Ferraris 2007:12 [ref. 29155]. •Valid as Acrochordonichthys mahakamensis Ng & Ng 2001 -- (Vidthayanon & Ng 2003:6 [ref. 27425], Ferraris 2007:12 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys mahakamensis Ng & Ng 2001. Akysidae: Parakysinae. Distribution: Eastern Borneo, Indonesia. Habitat: freshwater.

manipurensis, Laguvia Arunkumar [L.] 2000:194, Fig. 1 [Indian Journal of Fisheries v. 47 (no. 3); ref. 25658] Lairaok Maru stream near Moreh, 110 kilometers from Imphal City, Yu River System, Manipur, India. Holotype: MUMF 3001/1A. Paratypes: MUMF 3001/4A (4). Type catalog: Ferraris 2007:382 [ref. 29155]. •Valid, but generic placement insertae sedis -- (Ng & Kottelat 2005:20 [ref. 28207], Thomson & Page 2006:23 [ref. 28859]). •Valid as Akysis manipurensis (Arunkumar 2000) -- (Jayaram 2006:161 [ref. 28762], Vishwanath et al. 2007:2675 [ref. 29124], Ng 2008:261 [ref. 29979], Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:218 [ref. 32989]). •Incertae sedis in Sisoridae -- (Ferraris 2007:382 [ref. 29155]). Current status: Valid as Akysis manipurensis (Arunkumar 2000). Akysidae: Akysinae. Distribution: Manipur, India. Habitat: freshwater.

melanogaster, Pimelodus Bleeker [P.] 1854:89 [Natuurkundig Tijdschrift voor Nederlandsch Indië v. 7 (no. 1); ref. 16939] Eastern Sumatra, Palembang Province, confluence of Lamatang and Enim rivers, Indonesia. Holotype (unique): BMNH 1863.12.4.160. Bleeker specimens: RMNH 15972 (1). Type catalog: Ferraris 2007:13 [ref. 29155]. See van Oijen et al. 2009:195 [ref. 30423]. •Questionably valid as Acrochordonichthys melanogaster (Bleeker 1854) -- (Roberts 1989:138 [ref. 6439], Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:74 [ref. 23448]). •Valid as Acrochordonichthys cf. melanogaster (Bleeker 1854) -- (Tan & Ng 1999:288 [ref. 24254]). •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:411 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

meridionalis, Akysis Ng [H. H.] & Siebert [D. J.] 2004:2, Figs. 1-2 [Zootaxa No. 733; ref. 27936] Barito River drainage, Sungai Laung at Dessa Maruwei, 0°21.986'S, 114°44.103'E, Kalimantan Tengah, Borneo, Indonesia. Holotype: MZB 6102. Paratypes: BMNH 1998.9.30.18 (1). Type catalog: Ferraris 2007:17 [ref. 29155]. •Valid as Akysis meridionalis Ng & Siebert 2004 -- (Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius meridionalis (Ng & Siebert 2004) -- (Ferraris 2007:17 [ref. 29155], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius meridionalis (Ng & Siebert 2004). Akysidae: Akysinae. Distribution: Barito River basin, Borneo, Indonesia. Habitat: freshwater.

microps, Akysis Ng [H. H.] & Tan [H. H.] 1999:359, Figs. 5-7 [Zoological Studies v. 38 (no. 3); ref. 24159] Sungai Kahang and tributary, about 44.4 kilometers from Mersing turnoff to Kluang just before side road to Endau Rompin Taman Negara, kilometer 96 from Mersing to Batu Pahat (2°3.93'N, 103°31.58'E), Johor, Malaysia. Holotype: ZRC 42596. Paratypes: BMNH 1998.7.19.1-2 (2); CAS 99371 (1); CMK 14803 (2); MZUSP 53470 (4, 1 c&s); ZRC 42597 (6), 42599 (5). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:11 [ref. 29920]. •Valid as Akysis microps Ng & Tan 1999 -- (Ng & Freyhof 2003:315 [ref. 27399], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis microps Ng & Tan 1999. Akysidae: Akysinae. Distribution: Malay Peninsula. Habitat: freshwater.

nitidus, Akysis Ng [H. H.] & Rainboth [W. J.] 2005:40, Fig. 8 [Raffles Bulletin of Zoology Suppl. no. 13; ref. 28353] Champasak Province, Mekong River at Ban Hang Khone, just downstream from Khone falls, Laos. Holotype (unique): UMMZ 235400. Type catalog: Ferraris 2007:17 [ref. 29155]. •Valid as Akysis nitidus Ng & Rainboth 2005. •Valid as Pseudobagarius nitidus (Ng & Rainboth 2005) -- (Ferraris 2007:17 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius nitidus (Ng & Rainboth 2005). Akysidae: Akysinae. Distribution: Mekong River basin, Laos. Habitat: freshwater.

notialis, Parakysis Ng [H. H.] & Kottelat [M.] 2003:48, Figs. 1, 2A, 3A [Ichthyological Research v. 50; ref. 26707] Barito River drainage, area of Tamiyang Layang, Kalimantan Selatan, Borneo, 2°01'S, 115°07'E. Holotype: MZB 5994. Paratypes: CMK 16736 (2), ZRC 46951 (1). Type catalog: Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:12 [ref. 29920]. •Valid as Parakysis notialis Ng & Kottelat 2003 -- (Ferraris 2007:16 [ref. 29155], Ng 2009:39 [ref. 30102], Kottelat 2013:220 [ref. 32989], Kottelat 2013:220 [ref. 32989]). Current status: Valid as Parakysis notialis Ng & Kottelat 2003. Akysidae: Parakysinae. Distribution: Southern Borneo, Indonesia. Habitat: freshwater.

obscurus, Acrochordonichthys Popta [C. M. L.] 1904:187 [Notes from the Leyden Museum v. 24 (no. 4) (art. 6) (for Oct. 1902); ref. 3547] Bongan River, Putero, Borneo, Indonesia. Holotype: RMNH 7556. Type catalog: Ferraris 2007:13 [ref. 29155]. •Questionably a synonym of Acrochordonichthys melanogaster (Bleeker 1854) -- (Roberts 1989:138 [ref. 6439]). •Valid as Acrochordonichthys obscurus Popta 1904 -- (Martin-Smith & Tan 1998:591 [ref. 23647]). •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:412 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

pachyderma, Acrochordonichthys Vaillant [L. L.] 1902:66, Figs. 11-13 [Notes from the Leyden Museum v. 24 (note 1); ref. 4490] Bloeoe [Bluu] River, Kapuas basin, Kalimantan Timor, Borneo, Indonesia. Holotype (unique): RMNH 7560. Type catalog: Ferraris 2007:13 [ref. 29155]. •Questionably a synonym of Acrochordonichthys melanogaster (Bleeker 1854) -- (Roberts 1989:138 [ref. 6439]). •Valid as Acrochordonichthys pachyderma Vaillant 1902 -- (Burgess 1989:118 [ref. 12860], Ng & Ng 2001:410 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:217 [ref. 32989]). Current status: Valid as Acrochordonichthys pachyderma Vaillant 1902. Akysidae: Parakysinae. Distribution: Borneo, Indonesia. Habitat: freshwater.

pallida, Sosia chamaeleon var. Vaillant [L. L.] 1902:85, Figs. 22-24 [Notes from the Leyden Museum v. 24 (note 1); ref. 4490] Kapuas, Mandi and Sibau rivers, Borneo, Indonesia. Lectotype: RMNH 7848. Type catalog: Ferraris 2007:13 [ref. 29155]. Lectotype selected by Ng & Ng 2001:406 [ref. 25771]. •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:412 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

patrator, Akysis Ng [H. H.], Pawangkhanant [P.] & Suwannapoom [C.] 2022:3, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 31 (no. 3): IEF-1186; ref. 39344] Huay Saung Ga Ria, Khwae Noi subdrainage, Mae Klong drainage, Kanchanaburi Province, Thailand, 15°13'42"N, 98°26'42"E. Holotype: AUP 02025. Paratypes: AUP 02026-02030 (5). •Valid as Akysis patrator Ng, Pawangkhanant & Suwannapoom 2022. Current status: Valid as Akysis patrator Ng, Pawangkhanant & Suwannapoom 2022. Akysidae: Akysinae. Distribution: Southeast Asia: Mae Klong drainage, Kanchanaburi Province, western Thailand. Habitat: freshwater.

pictus, Akysis Günther [A.] 1883:138 [Annals and Magazine of Natural History (Series 5) v. 11 (no. 62); ref. 14339] Tenasserim, Myanmar. Syntypes: BMNH 1880.12.1.25-26 (2). Type catalog: Ferraris 2007:14 [ref. 29155] •Valid as Akysis pictus Günther 1883 -- (He & Chen 1981:211 [ref. 21313], Burgess 1989:118 [ref. 12860], Talwar & Jhingran 1991:617 [ref. 20764], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng 1999:542 [ref. 24609], Ng & Kottelat 2000:9 [ref. 25042], Ng & Freyhof 2003:315 [ref. 27399], Ng & Kottelat 2004:194 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Jayaram 2006:162 [ref. 28762], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2007:53 [ref. 29306], Ng 2008:260 [ref. 29979], Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis pictus Günther 1883. Akysidae: Akysinae. Distribution: Myanmar. Habitat: freshwater.

platycephalus, Acrochordonichthys Bleeker [P.] 1858:224 [Acta Societatis Regiae Scientiarum Indo-Neêrlandicae v. 4 (art. 2); ref. 365] Palembang, southern Sumatra, Indonesia. Holotype (unique): BMNH 1863.12.4.152. Type catalog: Ferraris 2007:13 [ref. 29155]. Illustrated as Silur. Pl. 36 (fig. 2 not 4) [cumulative Pl. 84], published in Bleeker 1863 [ref. 393]. See van Oijen et al. 2009:193 [ref. 30423]. •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Burgess 1989:118 [ref. 12860], Ng & Ng 2001:411 [ref. 25771], Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

pleurostigma, Pimelodus Bleeker [P.] 1855:442 [Natuurkundig Tijdschrift voor Nederlandsch Indië v. 7 (no. 3); ref. 16941] Jakarta, Java, Indonesia. Syntypes: (8) BMNH 1863.12.4.161 (1) Java, NMV 45993 (1); RMNH 4188 (1), 6879 (4). Type catalog: Ferraris 2007:13 [ref. 29155]. See van Oijen et al. 2009:199 [ref. 30423]. •Valid as Acrochordonichthys pleurostigma (Bleeker 1855) -- (Burgess 1989:118 [ref. 12860]). •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:411 [ref. 25771], Kottelat 2013:218 [ref. 32989]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

portellus, Akysis Ng [H. H.] 2009:3, Figs. 1-5 [Journal of Threatened Taxa v. 1 (no. 1); ref. 30104] Shwe Kyinm 17°55'N, 96°53'E, Than Kyaw Toe, Bago division, Myanmar. Holotype: ZRC 51138. Paratypes: NRM 57228 (5), UMMZ 248469 (12), ZRC 51139 (9). Plus non-type material. •Valid as Akysis portellus Ng 2009 -- (Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis portellus Ng 2009. Akysidae: Akysinae. Distribution: Sittang River drainage, southern Myanmar. Habitat: freshwater.

prashadi, Akysis Hora [S. L.] 1936:200, Figs. 1, 2(b-c) [Records of the Indian Museum (Calcutta) v. 38 (pt 2); ref. 13703] Indawgyi Lake and round about Kamaing in the Myitkyina District, upper Myanmar. Holotype (unique): ZSI F10873/1. Type catalog: Ferraris 2007:14 [ref. 29155] See Das 2003:378 [ref. 27706]. •Valid as Akysis prashadi Hora 1936 -- (He & Chen 1981:211 [ref. 21313], Burgess 1989:118 [ref. 12860], Talwar & Jhingran 1991:617 [ref. 20764], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng 1999:545 [ref. 24609], Ng & Kottelat 2000:9 [ref. 25042], Ng & Freyhof 2003:315 [ref. 27399], Ng & Kottelat 2004:194 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Jayaram 2006:163 [ref. 28762], Vishwanath et al. 2007:2676 [ref. 29124], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2007:53 [ref. 29306], Ng 2008:260 [ref. 29979], Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Ahmed et al. 2013:286 [ref. 32872], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344], Chen et al. 2024:115 [ref. 41792]). Current status: Valid as Akysis prashadi Hora 1936. Akysidae: Akysinae. Distribution: Southeast Asia: Manipur, India, Bangladesh and Irrawaddy River basin, Myanmar. Habitat: freshwater.

pseudobagarius, Akysis Roberts [T. R.] 1989:138, Fig. 107 [Memoirs of the California Academy of Sciences No. 14; ref. 6439] Bar in mouth of Sungai Melawi at Sintang, Indonesia. Holotype: MZB 3691. Paratypes: CAS 49414 (1), MZB 3692 (1), UMMZ 155702 (1). Type catalog: Ferraris 2007:17 [ref. 29155]. •Valid as Akysis pseudobagarius Roberts 1989 -- (Kottelat et al. 1993:75 [ref. 23448], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Burgess & Finley 1996:165 [ref. 22901], Ng & Kottelat 1998:1059 [ref. 23903], Ng 1999:547 [ref. 24609], Ng & Kottelat 2000:8 [ref. 25042], Ng & Kottelat 2004:199 [ref. 27854], Ng & Siebert 2004:5 [ref. 27936], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius pseudobagarius (Roberts 1989) -- (Ferraris 2007:17 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius pseudobagarius (Roberts 1989). Akysidae: Akysinae. Distribution: Western Borneo, Indonesia. Habitat: freshwater.

pulvinatus, Akysis Ng [H. H.] 2007:52, Figs. 1, 2, 5a [Zootaxa No. 1608; ref. 29306] Stream draining into Andaman Sea upstream of Kapoe, 9°34'14.0"N, 98°41'40.4"E, Ranong Province, Thailand. Holotype: UMMZ 248249. Paratypes: UMMZ 245696 (1), 248250 (2); ZRC 51009 (3). Type catalog: Ng & Kim 2008:12 [ref. 29920]. •Valid as Akysis pulvinatus Ng 2007 -- (Ng 2008:261 [ref. 29979], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis pulvinatus Ng 2007. Akysidae: Akysinae. Distribution: Kra Isthmus, upper Tapi River drainage and hillstreams flowing into the Andaman Sea, southern Thailand. Habitat: freshwater.

recavus, Akysis Ng [H. H.] & Kottelat [M.] 1998:1090, Figs. 4l, 13i, 16, 17a [Journal of Natural History v. 32 (no. 7); ref. 23903] Western Chao Phraya basin, Thailand. Holotype: ZRC 40716. Paratypes: CMK 10740 (3), 11020 (1); UMMZ 233005 (2); ZRC 40717 (2). Type catalog: Ferraris 2007:14 [ref. 29155], Ng & Kim 2008:12 [ref. 29920]. •Valid as Akysis recavus Ng & Kottelat 1998 -- (Ng & Tan 1999:362 [ref. 24159], Ng 1999:547 [ref. 24609], Ng & Freyhof 2003:315 [ref. 27399], Ng & Rainboth 2005:33 [ref. 28353], Page et al. 2007:292 [ref. 29140], Ferraris 2007:14 [ref. 29155], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis recavus Ng & Kottelat 1998. Akysidae: Akysinae. Distribution: Chao Phraya and Mae Klong drainages, Thailand. Habitat: freshwater.

rugosus, Pimelodus Bleeker [P.] 1846:11 [Verhandelingen van het Bataviaasch Genootschap van Kunsten en Wetenschappen. v. 21 (art. 7); ref. 16879] Java, Indonesia. Bleeker specimens and/or syntypes: BMNH 1863.12.4.150 (1) Sumatra, 1863.12.4.161 (1) Sumatra, RMNH 6883 (2) Java. Type catalog: Ferraris 2007:13 [ref. 29155]. Also in Bleeker 1847:168 [ref. 314]. See under Acrochordonichthys rugosus in Rainboth 1996:158 [ref. 22772] and Ng & Rachmatika 1999:171 [ref. 23964] for comments. See van Oijen et al. 2009:197 [ref. 30423]. •See under Acrochordonichthys rugosus in Rainboth 1996:158 [ref. 22772] and Ng & Rachmatika 1999:171 [ref. 23964]. •Valid as Acrochordonichthys rugosus (Bleeker 1846) -- (Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:75 [ref. 23448], Ng & Ng 2001:411 [ref. 25771], Parenti & Lim 2005:192 [ref. 28285], Ferraris 2007:13 [ref. 29155], Kottelat 2013:217 [ref. 32989], Ng et al. 2019:530 [ref. 36606]). Current status: Valid as Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Distribution: Southeast Asia. Habitat: freshwater.

scorteus, Akysis Page [L. M.], Hadiaty [R. K.] & López [J. A.] in Page, Hadiaty, López, Rachmatika & Robins 2007:296, Figs. 2, 3 (right column) [Copeia 2007 (no. 2); ref. 29140] Way Seputih, 5°04.310'S, 104°53.048'E, Lampung, Sumatra, Indonesia. Holotype: MZB 15191. Paratypes: UF 162465 (1). •Valid as Akysis scorteus Page, Hadiaty & López 2007 -- (Ng 2008:261 [ref. 29979], Ng 2009:46 [ref. 30100], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis scorteus Page, Hadiaty & López 2007. Akysidae: Akysinae. Distribution: Lampung, Sumatra. Habitat: freshwater.

septentrionalis, Acrochordonichthys Ng [H. H.] & Ng [P. K. L.] 2001:401, Figs. 6, 12 [Journal of Fish Biology v. 58 (no. 2); ref. 25771] Kwae Noi River, Kanchanaburi Province, Thailand. Holotype: NIFI 3128. Paratypes: NIFI 3129 (2); ZRC 2341 (1), 2360 (1). Type catalog: Ferraris 2007:13 [ref. 29155], Ng & Kim 2008:5 [ref. 29920]. •Valid as Acrochordonichthys septentrionalis Ng & Ng 2001 -- (Vidthayanon & Ng 2003:6 [ref. 27425], Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Valid as Acrochordonichthys septentrionalis Ng & Ng 2001. Akysidae: Parakysinae. Distribution: Thailand and Malaysia. Habitat: freshwater.

similis, Akysis Ng [H. H.] & Kottelat [M.] 1998:1074, Figs. 4e, 9, 13c [Journal of Natural History v. 32 (no. 7); ref. 23903] Knh Thuy Cai canal, 10 kilometers east of Vinh Long, at mouth of canal into Mekong River, Vietnam. Holotype: UMMZ 214902. Paratypes: UMMZ 214903-09 (100, 3, 10, 9, 37, 7, 4), 217740 (1), 21792 (1), 224615 (3), 224621 (2), 226871 (2), 227494-96 (2, 1, 1); ZRC 40718 [ex UMMZ] (5). Type catalog: Ferraris 2007:17 [ref. 29155], Ng & Kim 2008:12 [ref. 29920] •Valid as Akysis similis Ng & Kottelat 1998 -- (Ng & Rainboth 2005:41 [ref. 28353]). •Valid as Pseudobagarius similis (Ng & Kottelat 1998) -- (Ferraris 2007:17 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407], Taki et al. 2021:297 [ref. 39830]). Current status: Valid as Pseudobagarius similis (Ng & Kottelat 1998). Akysidae: Akysinae. Distribution: Southeast Asia: lower Mekong River basin, Vietnam and Cambodia. Habitat: freshwater, brackish.

sinensis, Akysis He [M.-J.] in He & Chen 1981:209 (English p. 213), Fig. 1 [Zoological Research v. 2 (no. 3); ref. 21313] Lancang Jiang, Xishuangbanna Daizu Zizhizhou, Yunnan Province, China. Syntypes: IHASW 638237 (1), 638283 (1); KIZ 735007-08 (1, 1). Type catalog: Ferraris 2007:17 [ref. 29155], Du et al. 2013:354 [ref. 32939]. Spelled sinesis once in English summary (p. 213). First reviser Eschmeyer 1998 according to Ferraris 2007:17 [ref. 29155] , selecting the spelling sinensis; but also sinesis could be regarded as a misspelling. •Valid as Akysis sinensis He 1981 -- (Zhu 1995:158 [ref. 25213], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Ng & Kottelat 1998:1059 [ref. 23903], Chen in Chu et al. 1999:113 [ref. 24534], Ng 1999:547 [ref. 24609], Ng & Kottelat 2000:9 [ref. 25042], Ng & Rainboth 2005:33 [ref. 28353], Zhang et al. 2016:170 [ref. 34477], Fu et al. 2021:9572 [ref. 39347]). •Valid as Pseudobagarius sinensis (He 1981) -- (Ferraris 2007:17 [ref. 29155], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]), Current status: Valid as Pseudobagarius sinensis (He 1981). Akysidae: Akysinae. Distribution: Southeast Asia: upper Mekong River basin (Yunnan/China). Habitat: freshwater.

strigosus, Acrochordonichthys Ng [H. H.] & Ng [P. K. L.] 2001:403, Figs. 5-6, 8, 13 [Journal of Fish Biology v. 58 (no. 2); ref. 25771] Mouth of Sungai Putan to 3 kilometers downstream, 1°02'28.0"N, 112°59'58.6"E, Sungai Sibau, Kalimantan Barat, Borneo, Indonesia. Holotype (unique): MZB 9333. Type catalog: Ferraris 2007:13 [ref. 29155]. •Valid as Acrochordonichthys strigosus Ng & Ng 2001 -- (Ferraris 2007:13 [ref. 29155], Kottelat 2013:218 [ref. 32989]). Current status: Valid as Acrochordonichthys strigosus Ng & Ng 2001. Akysidae: Parakysinae. Distribution: Kapuas River basin, western Borneo. Habitat: freshwater.

subtilis, Akysis Ng [H. H.] & Kottelat [M.] 1998:1076, Figs. 4g, 10, 13e [Journal of Natural History v. 32 (no. 7); ref. 23903] Mekong River, 21.5 kilometers downstream from Ban Tha Kai, 21.5 kilometers downstream from Mukdahan, Nakhon Phanom, Thailand. Holotype: UMMZ 214910. Paratypes: UMMZ 214477 (1), 214484 (1), 214911 (1); ZRC 40730 (1). Type catalog: Ng & Kim 2008:12 [ref. 29920]. •Valid as Akysis subtilis Ng & Kottelat 1998 -- (Kottelat 2001:140 [ref. 25780], Ng & Rainboth 2005:33 [ref. 28353]). •Valid as Pseudobagarius subtilis (Ng & Kottelat 1998) -- (Ng & Kim 2008:12 [ref. 29920], Kottelat 2013:220 [ref. 32989], Ng & Kottelat 2021:329 [ref. 38407]). Current status: Valid as Pseudobagarius subtilis (Ng & Kottelat 1998). Akysidae: Akysinae. Distribution: Mekong River basin, Laos and Thailand. Habitat: freshwater.

variegatus, Akysis variegatus Prashad [B.] & Mukerji [D. D.] 1929:180, Pl. 8 (figs. 1-2) [Records of the Indian Museum (Calcutta) v. 31 (pt 3); ref. 3558] South end of Indawgyi Lake, along southwestern shore, Myitkyina District, Upper Myanmar. Holotype (unique): ZSI F10873/1. Type catalog: Menon & Yazdani 1968:126 [ref. 20743], Ferraris 2007:14 [ref. 29155] Subjectively invalid; preoccupied in Akysis by Pimelodus variegatus Bleeker 1846; the authors even state that this new subspecies is closely allied both to Akysis variegatus Bleeker and Akysis pictus Günther. See Das 2003:378 [ref. 27706] with date as 1930. •Synonym of Akysis prashadi Hora 1936 -- (Ng 1999:545 [ref. 24609], Ng & Freyhof 2003:315 [ref. 27399], Jayaram 2006:163 [ref. 28762], Vishwanath et al. 2007:2676 [ref. 29124], Ferraris 2007:14 [ref. 29155], Kottelat 2013:219 [ref. 32989]). 2°Homonym. Current status: Synonym of Akysis prashadi Hora 1936. Akysidae: Akysinae. Habitat: freshwater.

variegatus, Pimelodus Bleeker [P.] 1846:53 [177] [Verhandelingen van het Bataviaasch Genootschap van Kunsten en Wetenschappen. v. 21 (art. 5); ref. 313] Jakarta, Java, Indonesia. Syntypes: BMNH 1863.12.4.187 (1) Java, ?NMV 46004 (1), RMNH 6881 (16). Type catalog: Ferraris 2007:15 [ref. 29155]. Also in Bleeker 1846:53 [ref. 313]. See van Oijen et al. 2009:205 [ref. 30423]. •Valid as Akysis variegatus (Bleeker 1846) -- (He & Chen 1981:212 [ref. 21313], Kottelat et al. 1993:75 [ref. 23448], Roberts 1993:31 [ref. 21799], Ng & Kottelat 1996:19 [ref. 22212], Ng 1996:3 [ref. 22484], Rainboth 1996:159 [ref. 22772], Ng & Kottelat 1998:1059 [ref. 23903], Ng & Tan 1999:362 [ref. 24159], Ng 1999:547 [ref. 24609], Ng & Kottelat 2000:9 [ref. 25042], Ng & Kottelat 2004:194 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Page et al. 2007:292 [ref. 29140], Ferraris 2007:15 [ref. 29155], Ng 2008:261 [ref. 29979], Ng 2009:48 [ref. 30100], Ng 2009:7 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Hasan et al. 2022:6035 [ref. 39888], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis variegatus (Bleeker 1846). Akysidae: Akysinae. Distribution: Southeast Asia: western Java (Indonesia). Habitat: freshwater.

varius, Acrochordonichthys Popta [C. M. L.] 1904:189 [Notes from the Leyden Museum v. 24 (no. 4) (art. 6) (for Oct. 1902); ref. 3547] Bo River, Mahakam basin, Borneo. Syntypes: RMNH 7559 (2). Type catalog: Ferraris 2007:13 [ref. 29155]. •Questionably a synonym of Acrochordonichthys melanogaster (Bleeker 1854) -- (Roberts 1989:138 [ref. 6439]). •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:412 [ref. 25771], Ferraris 2007:13 [ref. 29155]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.

varius, Akysis Ng [H. H.] & Kottelat [M.] 1998:1093, Figs. 4m, 13k, 17b, 18 [Journal of Natural History v. 32 (no. 7); ref. 23903] Xe Bangfai, about 3 kilometers upriver of Pan Pakphanang, Khammouan Province, Laos. Holotype: ZRC 41015. Paratypes: CMK 12433 (6), 12609 (1); UMMZ 214913 (2); USNM 232930 (7). Type catalog: Ferraris 2007:15 [ref. 29155], Ng & Kim 2008:14 [ref. 29920]. •Valid as Akysis varius Ng & Kottelat 1998 -- (Ng 1999:547 [ref. 24609], Ng & Kottelat 2000:9 [ref. 25042], Kottelat 2001:140 [ref. 25780], Ng & Freyhof 2003:315 [ref. 27399], Ng & Kottelat 2004:194 [ref. 27854], Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Ferraris 2007:15 [ref. 29155], Ng 2008:261 [ref. 29979], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Kottelat 2015:47 [ref. 33971], Taki et al. 2021:298 [ref. 39830], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis varius Ng & Kottelat 1998. Akysidae: Akysinae. Distribution: Southeast Asia: Mekong River basin, Cambodia, Laos and Thailand. Habitat: freshwater.

verrucosa, Parakysis Herre [A. W. C. T.] 1940:12, Pl. 6 [Bulletin of the Raffles Museum No. 16; ref. 2130] Mawai District, Johore, Malaysia. Holotype: CAS-SU 33009. Paratypes: (13) BMNH 1938.12.1.147-148 (2); CAS-SU 33010 (8), ?69023 (1, c&s); ?ZRC 1066 (1). Type catalog: Böhlke 1953:43 [ref. 12291], Alfred 1970:69 [ref. 23931], Ferraris 2007:16 [ref. 29155], Ng & Kim 2008:12 [ref. 29920]. •Valid as Parakysis verrucosus Herre 1940 -- (Burgess 1989:118 [ref. 12860], Kottelat et al. 1993:76 [ref. 23448], Ng & Lim 1995:264 [ref. 21887], Kottelat & Lim 1996:241 [ref. 23210], Burgess & Finley 1996:165 [ref. 22901], Ng & Kottelat 2003:48 [ref. 26707], Ferraris 2007:16 [ref. 29155], Ng 2009:39 [ref. 30102], Kottelat 2013:220 [ref. 32989], Ng et al. 2019:530 [ref. 36606]). Current status: Valid as Parakysis verrucosus Herre 1940. Akysidae: Parakysinae. Distribution: Southeast Asia: eastern Malaya (Malaysia), Riau Archipelago (Indonesia). IUCN (2019): Vulnerable. Habitat: freshwater.

vespa, Akysis Ng [H. H.] & Kottelat [M.] 2004:194, Figs. 1-3, 5 [Ichthyological Exploration of Freshwaters v. 15 (no. 3); ref. 27854] Stream "Chon Son" between Kyondaw and Phadaw, about 20 kilometers northwest of Payathouzu (at border with Thailand), 15°25'N, 98°15'E, Kayin State, Myanmar. Holotype: ZRC 46423. Paratypes: CMK 17788 (8), 17953 (5), 17977 (5); ZRC 49155 (4). Type catalog: Ferraris 2007:15 [ref. 29155], Ng & Kim 2008:15 [ref. 29920]. •Valid as Akysis vespa Ng & Kottelat 2004 -- (Ng & Rainboth 2005:33 [ref. 28353], Ng 2006:20 [ref. 28586], Jayaram 2006:164 [ref. 28762], Page et al. 2007:292 [ref. 29140], Ferraris 2007:15 [ref. 29155], Ng 2007:53 [ref. 29306], Ng 2008:261 [ref. 29979], Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis vespa Ng & Kottelat 2004. Akysidae: Akysinae. Distribution: Ataran River drainage, Kayin State, Myanmar. Habitat: freshwater.

vespertinus, Akysis Ng [H. H.] 2008:256, Fig. 1, 4a, 5a [Ichthyological Exploration of Freshwaters v. 19 (no. 3); ref. 29979] Headwaters of Ann Chaung drainage, ca. 19 kilometers east by south of Ann, 19°43'N, 94°11'E, Rakhine state, Myanmar. Holotype: UMMZ 248755. Paratypes: CMK 20752 (2); UMMZ 248756 (4), 248757 (2); ZRC 51345 (2). •Valid as Akysis vespertinus Ng 2008 -- (Ng 2009:6 [ref. 30104], Ng 2011:66 [ref. 31572], Kottelat 2013:219 [ref. 32989], Ng et al. 2022:8 [ref. 39344]). Current status: Valid as Akysis vespertinus Ng 2008. Akysidae: Akysinae. Distribution: Ann Chaung drainage, Rakhine, western Myanmar. Habitat: freshwater.

zonatus, Pimelodus Bleeker [P.] 1855:444 [Natuurkundig Tijdschrift voor Nederlandsch Indië v. 7 (no. 3); ref. 16941] Jakarta, Java, Indonesia. Syntypes: (9) BMNH 1863.12.4.175 (1), NMV 45992 (1), RMNH 6880 (5). Type catalog: Ferraris 2007:13 [ref. 29155]. See van Oijen et al. 2009:201 [ref. 30423]. •Synonym of Acrochordonichthys rugosus (Bleeker 1846) -- (Ng & Ng 2001:411 [ref. 25771], Ferraris 2007:13 [ref. 29155]). Current status: Synonym of Acrochordonichthys rugosus (Bleeker 1846). Akysidae: Parakysinae. Habitat: freshwater.