maon, Sinogastromyzon Nguyen [V. H.] & Nguyen [H. D.] in Nguyen 2005:607, Fig. 36 [Freshwater fishes of Vietnam v. 2; ref. 29730] Ma River, Sông Ma, Son La Province, Vietnam. Holotype: NCNTTS I, Bac Ninh (lost). Paratypes: (1) lost. Types at RIA 1 [= NCNTTSI] are lost according to Endruweit 2014:144 [ref. 33205]. •Questionably valid as Sinogastromyzon maon Nguyen & Nguyen 2005 -- (Kottelat 2012:55 [ref. 32367], Kottelat 2013:190 [ref. 32989]). Current status: Uncertain as Sinogastromyzon maon Nguyen & Nguyen 2005. Balitoridae. Distribution: Ma river system, Sông Ma district, Son La Province, Vietnam. Habitat: freshwater.