nigra, Gobius fluviatilis forma Kessler [K. F.] 1859:247 [Bulletin de la Société Impériale des Naturalistes de Moscou v. 32 (no. 3); ref. 18391] Karadag, Russia. Neotype: ZIN 37261 (1 of 3, 186 mm). Objectively invalid; preoccupied by Gobius niger Linnaeus 1758. Neotype designated by Pinchuk 1977 [ref. 8999]. •Synonym of Neogobius fluviatilis (Pallas 1814) -- (Miller 1973:502 [ref. 6888], Kottelat 1997:178 [ref. 22952], Vasil'eva 2003:S49 [ref. 28444], Neilson & Stepien 2009:96 [ref. 30487], Parin et al. 2014:493 [ref. 33547], Parenti 2021:73 [ref. 38603]). 1°Homonym. Current status: Synonym of Neogobius fluviatilis (Pallas 1814). Gobiidae: Gobiinae. Habitat: freshwater, brackish, marine.