bathybius, Gobius Kessler [K. F.] 1877:17, Pl. 1 (fig. 3) [The Aralo-Caspian Expedition; ref. 2597] Svinoi Island, south of Baky, Caspian Sea, Azerbaijan, 756 feet [108 Russian fathoms]. Holotype (unique): No types at ZIN. •Valid as Chasar bathybius (Kessler 1877) -- (Pinchuk et al. in Miller 2004:97 [ref. 27853]). •Valid as Ponticola bathybius (Kessler 1877) -- (Neilson & Stepien 2009:97 [ref. 30487], Freyhof 2011:286 [ref. 31742], Jouladeh-Roudbar et al. 2015:899 [ref. 34062], Jouladeh-Roudbar et al. 2015:899 [ref. 34062], Esmaeili et al. 2017:84 [ref. 35254], Esmaeili et al. 2018:66 [ref. 36089], Jouladeh-Roudbar et al. 2020:241 [ref. 37983], Parenti 2021:74 [ref. 38603], Zarei et al. 2021:[6] [ref. 38262]). •Valid as Neogobius bathybius (Kessler 1877) -- (Berg 1949:1094 [ref. 20662], Coad 1995:31 [ref. 23608], Reshetnikov et al. 1997:755 [ref. 24702], Vasil'eva 1996:448 [ref. 24650], Vasil'eva 1998:137 [ref. 23591], Bogutskaya & Naseka 2004:228 [ref. 28183], Esmaeili et al. 2010:377 [ref. 33391], Tajbakhsh et al. 2022:16 [ref. 39137], Zarei et al. 2022:174 [ref. 39576], Çiçek et al. 2024:307 [ref. 40789]). Current status: Valid as Neogobius bathybius (Kessler 1877). Gobiidae: Gobiinae. Distribution: Eurasia: Caspian Sea basin; introduced in Aral Sea. Habitat: brackish.