nigrescens, Thymallus arcticus Dorogostaisky [V.] 1923:76 [Trudy Irkutskogo Obshchestva Estestvoispytatelei v. 1 (no. 1); ref. 17411] Hövsgöl [Hovsgol] Lake, northern Mongolia, elevation 5620 feet. Syntypes: (at least 5) whereabouts unknown. Misspelled nigriscens in Catalog of Fishes 1998. See Kottelat 2006:26 [ref. 28831] for remarks on systematics. •Valid as Thymallus nigrescens Dorogostaisky 1923 -- (Berg 1948:431 [ref. 12882]). •Synonym of Thymallus arcticus (Pallas 1776), but a valid subspecies as described -- (Dorofeeva 1998:49 [ref. 23573] as nigrescens, Knizhin et al. 2006:418 [ref. 33991]). •Valid as Thymallus nigrescens Dorogostaisky 1923 -- (Scott & Crossman 1998:301 [ref. 24570], Kottelat 2006:26 [ref. 28831], Ocock et al. 2006:52 [ref. 28933], Dyldin et al. 2017:114 [ref. 35967], Weiss et al. 2020:[3] [ref. 37974], Bogdanov & Knizhin 2022:1699 [ref. 40154]). Current status: Valid as Thymallus nigrescens Dorogostaisky 1923. Salmonidae: Thymallinae. Distribution: North Asia: Lake Hovsgol (Mongolia). Habitat: freshwater.