mertensii, Thymalus Valenciennes [A.] in Cuvier & Valenciennes 1848:453 [Histoire naturelle des poissons v. 21; ref. 1013] East coast of Kamtchatka, Russia. Genus should have been Thymallus. •Synonym of Thymallus arcticus (Pallas 1776) -- (Berg 1948:429 [ref. 12882]). •Synonym of Thymallus arcticus (Pallas 1776), but a valid subspecies -- (Chereshnev 1996:603 [ref. 24659] as mertensi, Reshetnikov et al. 1997:732 [ref. 24702] as mertensi, Dorofeeva 1998:48 [ref. 23573], Sheiko & Fedorov 2000:19 [ref. 25650], Chereshnev et al. 2001:73 [ref. 26736] as mertensi, Fedorov et al. 2003:35 [ref. 27579]). •Valid as Thymallus mertensii Valenciennes 1848 -- (Bogutskaya & Naseka 2004:148 [ref. 28183], Kottelat 2006:86 [ref. 28831], Dyldin et al. 2017:114 [ref. 35967], Weiss et al. 2020:[3] [ref. 37974]). Current status: Valid as Thymallus mertensii Valenciennes 1848. Salmonidae: Thymallinae. Distribution: North Asia: Chukotka Penninsula, Koryak Autonomous Area, Kamchatka Peninsula, Taimyr Peninsula (Russia). Habitat: freshwater.