eurystomus, Asprocottus megalops Taliev [D. N.] 1955:195, 332, Figs. 70, 138-139 [ ref. 4316] Lake Baikal, Russia. ZIN 46624. Syntypes: (16) + (10). Type catalog: Spodareva et al. 2023:245 [ref. 40445] woth neotype. 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 (ZIN 4624) by Sideleva 2001 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]). •Valid as Abyssocottus eurystomus (Taliev 1955) -- (Bogdanov 2023:67 [ref. 40329]). Current status: Valid as Cyphocottus eurystomus (Taliev 1955). Cottidae. Distribution: North Asia: central and southern parts of Lake Baikal (Russia). Habitat: freshwater.