variabilis, Chondrostoma Yakovlev [V. E.] 1870:107 [7], Fig. 3 [On the new and little-known species of fish found in the mouths of the Volga; ref. 19610] Volga River Delta, Russia. Syntypes: whereabouts unknown. On p. 17 of separate. Author also seen as Jakowlew. •Synonym of Chondrostoma nasus (Linnaeus 1758), but a valid subspecies as variabile Yakovev 1870 -- (Berg 1949:622 [ref. 20661], Lelek 1987:178 [ref. 22962], Mitrofanov et al. 1987:182 [ref. 37731], Bogutskaya 1998:60 [ref. 23589]). •Valid as Chondrostoma variabilis Yakovlev 1870 -- (Elvira 1987:134 [ref. 6743], Elvira 1991:149, 150 [ref. 20036]). •Valid as Chondrostoma variabile Yakovlev 1870 -- (Reshetnikov et al. 1997:736 [ref. 24702], Bogutskaya 1998:61 [ref. 23589], Bogutskaya et al. 2001:43 [ref. 26178], Bogutskaya & Naseka 2004:84 [ref. 28183], Robalo et al. 2007:370 [ref. 28878] with author as Jakowlew, Kottelat & Freyhof 2007:190 [ref. 29996], Parin et al. 2014:73 [ref. 33547], Pozdeev et al. 2022:5 [ref. 39511], Dyldin et al. 2023:[31] [ref. 40328]). Current status: Valid as Chondrostoma variabile Yakovlev 1870. Leuciscidae: Leuciscinae. Distribution: Eurasia: Caspian Sea basin, Black Sea basin. Habitat: freshwater.