trigonocephalus, Cottus Gratzianov [V. I.] 1902:32 [Dnevnik' Zoologicheskogo Otdelenya Obshchestva Lyubiteley Estestvoznaniya, Antropologii i Etnografii, Moskva v. 3 (no. 3); ref. 1868] Ushkan Island, northern Lake Baikal, Russia, depth 280 feet (40 Russian fathoms). Holotype (unique): ZMMU P-3123. Type catalog: Vasil'eva et al. 2001:80 [ref. 25714]. •Synonym of Cottus kesslerii Dybowski 1874 -- (Berg 1949:1153 [ref. 20662] as kessleri, Sideleva 1982:27 [ref. 14469] as kessleri, Sideleva 1998:151 [ref. 23595]). •Synonym of Leocottus kesslerii (Dybowski 1874) -- (Sideleva 2001:59 [ref. 26181], Sideleva 2003:16, 151 [ref. 27815], Kottelat 2006:60 [ref. 28831], Bogdanov 2023:74 [ref. 40329]). Current status: Synonym of Leocottus kesslerii (Dybowski 1874). Cottidae. Habitat: freshwater.