rhodioni, Neogobius Vasil'eva [E. D.] & Vasil'ev [V. P.] 1994:753, Figs 4-5 [Voprosy Ikhtiologii v. 34 (no. 6); ref. 22082] Agoy River at Agoy village, Caucasus region. Holotype: ZMMU P-19238. Paratypes: ZMMU P-19239 (8). Plus additional non-type material. Type catalog: Vasil'eva et al. 2001:84 [ref. 25714]. •Valid as Neogobius rhodioni Vasil'eva & Vasil'ev 1994 -- (Reshetnikov et al. 1997:756 [ref. 24702], Vasil'eva 1998:142 [ref. 23591], Bogutskaya et al. 2001:47 [ref. 26178], Vasil'eva & Vasil'ev 2003:370 [ref. 27347], Bogutskaya & Naseka 2004:232 [ref. 28183], Kovačić & Engín 2008:79 [ref. 29624]). •Synonym of Neogobius constructor (Nordman 1840) -- (Fricke et al. 2007:105 [ref. 29533]). •Valid as Ponticola rhodioni (Vasil'eva & Vasil'ev 1994) -- (Neilson & Stepien 2009:97 [ref. 30487], Freyhof 2011:286 [ref. 31742], Stepien & Neilson 2013:2 [ref. 35325], Vasil'eva et al. 2016:9 [ref. 34347], Parenti 2021:75 [ref. 38603]). Current status: Valid as Ponticola rhodioni (Vasil'eva & Vasil'ev 1994). Gobiidae: Gobiinae. Distribution: Eurasia: rivers flowing into the Black Sea in the Caucasus region. Habitat: freshwater, brackish.