jaxartensis, Cottus gobio Berg [L. S.] 1916:437 [Les Poissons des eaux douces de la Russie; ref. 277] Ugam River, tributary of Chirchik River, Syr-Darya basin, Uzbekistan. Holotype (unique): ZIN 7799. Type catalog: Sideleva & Zhidkov 2021:239 [ref. 38705]. •Synonym of Cottus gobio Linnaeus 1758, but a valid subspecies as described -- (Berg 1949:1148 [ref. 20662]). •Tentatively a synonym of Cottus gobio Linnaeus 1758 -- (Kottelat 1997:169 [ref. 22952]). •Valid as Cottus jaxartensis Berg 1916 -- (Mitrofanov & Dukravec 1989:282 [ref. 37748], Sideleva 2021:255 [ref. 38323], Sideleva & Zhidkov 2021:239 [ref. 38705]). Current status: Valid as Cottus jaxartensis Berg 1916. Cottidae. Distribution: Central Asia: Syr-Darya basin, Uzbekistan, Kazakhstan and Kyrgyzstan. Habitat: freshwater, brackish.