erythrogenys, Varicorhinus Nguyen [V. H.] & Doan [L. H.] 1969:13, Fig. 12 in ref. 29795 [Some data on composition, origin, and distribution of cyprinid species in northern Vietnam; ref. 25483] Suoi Rut stream, Hoa Binh Province and Thac Ba, Yen Bai Province, Vietnam. Lectotype: RIAH 1068. Paralectotypes: (2) RIAH 1068 (1). See Kottelat 2001:113, 120 [ref. 25482] for availability issues. Spelled in more than one way originally, and Kottelat 2001:120 [ref. 25482] as first reviser selected erythrogenys. See Nguyen & Doan 2008 [ref. 29793] for an English translation of ref. 25483. Lectotype selected by Roberts & Catania 2008:93 [ref. 29794]. •Referable to Onychostoma -- (Roberts & Catania 2008:96 [ref. 29794], Xin et al. 2009:260 [ref. 30708]). •Questionably a synonym of Onychostoma leptura (Boulenger 1900) -- (Kottelat 2013:129 [ref. 32989]). •Tentative synonym of Onychostoma lepturus (Boulenger 1900) -- (Kottelat 2001:32 [ref. 25482]). •Valid as Scaphostoma erythrogenys (Nguyen & Doan 1969) -- (Hoàng et al. 2025:15 [ref. 41866]). Current status: Valid as Onychostoma erythrogenys (Nguyen & Doan 1969). Cyprinidae: Acrossocheilinae. Distribution: Southeast Asia: Suoi Rut stream, Hoa Binh Province and Thac Ba, Yen Bai Province, Vietnam. Habitat: freshwater, brackish.