otschakovinus, Mesogobius gymnotrachelus Zubovich [P. O.] 1925:191 [Trudy Gosudarstvennoi Chernomorsko-Azovskoi Stantsii v. 1; ref. 19635] Ochakov, northwestern Black Sea, Ukraine. Syntypes: (many) whereabouts unknown. •Synonym of Mesogobius gymnotrachelus (Kessler 1857) -- (Berg 1949:1098 [ref. 20662]). •Synonym of Neogobius gymnotrachelus (Kessler 1857) -- (Miller 1973:503 [ref. 6888], Kottelat 1997:178 [ref. 22952], Pinchuk et al. 2003:265 [ref. 27349], Vasil'eva 2003:S50 [ref. 28444]). •Synonym of Babka gymnotrachelus (Kessler 1857) -- (Neilson & Stepien 2009:97 [ref. 30487], Parenti 2021:68 [ref. 38603]). Current status: Synonym of Babka gymnotrachelus (Kessler 1857). Gobiidae: Gobiinae. Habitat: freshwater, brackish.