caspium, Gobiosoma Kessler [K. F.] 1877:38, Pl. 3 (fig. 9) [The Aralo-Caspian Expedition; ref. 2597] Middle Caspian Sea, depth 66-140 feet [9.5 to 20 Russian fathoms]. Syntypes: (20) BMNH 1897.7.5.12 [ex ZIN] (1), ZIN 3874 (2), 10910 (2). •Valid as Caspiosoma caspium (Kessler 1877) -- (Berg 1949:1104 [ref. 20662], Miller 1973:491 [ref. 6888], Miller in Whitehead et al. 1986:1028 [ref. 13677], Coad 1995:30 [ref. 23608], Reshetnikov et al. 1997:753 [ref. 24702], Vasil'eva 1998:131 [ref. 23591], Bogutskaya et al. 2001:47 [ref. 26178], Vasil'eva 2003:S43 [ref. 28444], Pinchuk et al. in Miller 2004:141 [ref. 27853], Bogutskaya & Naseka 2004:219 [ref. 28183], Kottelat & Freyhof 2007:564 [ref. 29996], Vasil'eva 2007:152 [ref. 30517], Neilson & Stepien 2009:96 [ref. 30487], Kovačić & Patzner 2011:185 [ref. 31737], Freyhof 2011:283 [ref. 31742], Parin et al. 2015:479 [ref. 33547], Manilo 2020:68 [ref. 37795], Parenti 2021:72 [ref. 38603]). Current status: Valid as Caspiosoma caspium (Kessler 1877). Gobiidae: Gobiinae. Distribution: Eurasia: Northern Black Sea, Sea of Azov, and Caspian Sea basins. Habitat: freshwater, brackish.