quadricapillus, Gobius Pallas [P. S.] 1814:159 [Zoographia Rosso-Asiatica v. 3; ref. 3351] Feodosiya [Feodosia] and Kherson, Crimea, Ukraine. No types known. •Synonym of Gobius niger Linnaeus 1758 -- (Vasil'eva 2003:S44 [ref. 28444]). •Not in the genus Proterorhinus, unpublished figure seen -- (Freyhof & Naseka 2008:330 [ref. 29387]). •Synonym of Proterorhinus marmoratus (Pallas 1814) -- (Berg 1949:1100 [ref. 20662], Miller 1973:511 [ref. 6888], Kottelat 1997:181 [ref. 22952], Vasil'eva 1998:145 [ref. 23591], Pinchuk et al. in Miller 2004:72 [ref. 27853], Neilson & Stepien 2009:98 [ref. 30487], Parin et al. 2014:502 [ref. 33547], Parenti 2021:76 [ref. 38603]). Current status: Synonym of Proterorhinus marmoratus (Pallas 1814). Gobiidae: Gobiinae. Habitat: freshwater, brackish, marine.