essipovi, Acerina cernus Burmakin [E. V.] 1941:156, Fig. 2 [Trudy Instituta polyarnogo zemedeliya v. 15; ref. 21765] Gyda Bay basin, Arctic Ocean; Yuribei River, Siberia, Russia. Syntypes: (5) whereabouts unknown. •Synonym of Acerina cernua (Linnaeus 1758) -- (Berg 1949:1047 [ref. 20662]). •Synonym of Gymnocephalus cernuus (Linnaeus 1758) -- (Kottelat 1997:172 [ref. 22952], Parin 2003:S3 [ref. 28536]). •Synonym of Gymnocephalus cernua (Linnaeus 1758) -- (Parin et al. 2014:354 [ref. 33547]). Current status: Synonym of Gymnocephalus cernua (Linnaeus 1758). Percidae: Percinae. Habitat: freshwater, brackish.