hexaocellum, Sinogastromyzon Nguyen [V. H.] 2006:612, Fig. 39 [Freshwater fishes of Vietnam v. 2; ref. 29730] Nâm So, Phong Châu, Lai Châu, Vietnam. Holotype: NCNTTS I. Paratypes: (5). Different authorship given in caption to Figure 39. Types at RIA 1 [= NCNTTSI] are lost according to Endruweit 2014:144 [ref. 33205]. •Questionably a synonym of Sinogastromyzon chapaensis Mai 1978 -- (Kottelat 2012:54 [ref. 32367], Kottelat 2013:190 [ref. 32989]). Current status: Uncertain as Sinogastromyzon chapaensis Mai 1978. Balitoridae. Distribution: Da River system in Nâm So, Phong Châu, Lai Châu, and Nâm Múc, Tuân Giáo, Dien Bien, Vietnam [if valid]. Habitat: freshwater.