daon, Gastromyzon Mai [D. Y.] 1978:216, Fig. 100 [Identification of the fresh-water fishes of North Viet Nam v. 1; ref. 13511] Phong-Thô and Nâm-Na creeks, Lai-Châu, northern Vietnam. Syntypes: DVZUT. •Valid as Pseudogastromyzon daon (Mai 1978) -- (Kottelat 2001:47 [ref. 25482], Kottelat 2001:101 [ref. 25780] as cf. daon, Kottelat 2012:57 [ref. 32367], Zhang et al. 2016:161 [ref. 34477]). •Valid as Beaufortia daon (Mai 197) -- (Kottelat 2013:191 [ref. 32989]). Current status: Uncertain as Pseudogastromyzon daon (Mai 1978). Gastromyzontidae. Distribution: Vietnam. Habitat: freshwater.