caspicus, Leuciscus rutilus var. Yakovlev [V. E.] 1870:103 [3], Fig. 2 [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. 3 of separate. Also described in Yakovlev 1873:334 [ref. 19640]. Author also seen as Jakovlev. •Synonym of Rutilus rutilus (Linnaeus 1758) -- (Coad 1995:20 [ref. 23608], Kottelat 1997:81 [ref. 22952]). •Synonym of Rutilus rutilus (Linnaeus 1758), but a valid subspecies as described -- (Kazanskii 1928:8 [ref. 14268], Berg 1949:513 [ref. 20661], Mitrofanov et al. 1987:50 [ref. 37731], Bogutskaya 1997:179 [ref. 23566], Reshetnikov et al. 1997:741 [ref. 24702], Bogutskaya 1998:70 [ref. 23589], Bogutskaya & Naseka 2004:87 [ref. 28183], Bogutskaya & Iliadou 2006:294 [ref. 28494], Fricke et al. 2007:46 [ref. 29533]). •Synonym of Rutilus lacustris (Pallas 1814) -- (Levin et al. 2017:44 [ref. 35061], Esmaeili et al. 2018:36 [ref. 36089], Dyldin et al. 2020:87 [ref. 37569], Jouladeh-Roudbar et al. 2020:144 [ref. 37983]). •Valid as Rutilus caspicus (Yakovlev 1870) -- (Kottelat & Freyhof 2007:239 [ref. 29996], Esmaeili et al. 2010:371 [ref. 33391], Jouladeh-Roudbar et al. 2015:879 [ref. 34062], Esmaeili et al. 2017:56 [ref. 35254], Dyldin et al. 2020:81 [ref. 37569]). Current status: Valid as Rutilus caspicus (Yakovlev 1870). Leuciscidae: Leuciscinae. Distribution: Eurasia: Caspian Sea drainages. Habitat: freshwater.