microcephalus, Cottus gobio var. Kessler [K. F.] 1868:44 [Trudy i Serda Russkich Estestvoispytatelej Prilozenie Suppl.; ref. 23057] Onega District, Russia. No types known. Original not seen. This name is suppressed in favor of koshewnikowi by Freyhof et al. 2005:165 [ref. 28259]; koshewnikowi is in prevailing usage. •Synonym of Cottus poecilopus Heckel 1837 -- (Kottelat 1997:170 [ref. 22952]). •Synonym of Cottus koshewnikowi Gratzianov 1907 -- (Freyhof et al. 2005:163 [ref. 28259], Sideleva et al. 2015:34 [ref. 35276]). Nomen Oblitum. Current status: Synonym of Cottus koshewnikowi Gratzianov 1907. Cottidae. Habitat: freshwater, brackish.