emarginatum, Platystoma Valenciennes [A.] in Cuvier & Valenciennes 1840:25 [Histoire naturelle des poissons v. 15; ref. 1008] Rio São Francisco, Brazil. Holotype (unique): MNHN A-9353 (mounted). Type catalog: Bertin & Estève 1950:60 [ref. 19575], Ferraris 2007:332 [ref. 29155]. •Valid as Duopalatinus emarginatus (Valenciennes 1840) -- (Burgess 1989:282 [ref. 12860], Britski 2001:20 [ref. 26046], Lundberg & Littmann in Reis et al. 2003:436 [ref. 27061], Ferraris 2007:332 [ref. 29155], Silva et al. 2020:12 [ref. 37809]). Current status: Valid as Duopalatinus emarginatus (Valenciennes 1840). Pimelodidae. Distribution: South America: São Francisco River basin (Brazil). Habitat: freshwater.