sanguinolentus, Carapus Castelnau [F. L.] 1855:85, Pl. 46 (fig. 1) [Animaux nouveaux or rares v. 2; ref. 766] Río Urubamba or upper Río Ucayali, Peru. Holotype (unique): MNHN 0000-3971. Type catalog: Ferraris et al. 2017:[35] [ref. 35236]. •Questionably a synonym of Sternopygus macrurus (Bloch & Schneider 1801) -- (Mago-Leccia 1994:23 [ref. 21320], Albert in Reis et al. 2003:489 [ref. 27061], Mirande & Koerber 2015:47 [ref. 35117]). •Synonym of Sternopygus macrurus (Bloch & Schneider 1801) -- (Albert & Fink 1996:89 [ref. 22024], Crampton et al. 2004:249 [ref. 27652], Hulen et al. 2005:412 [ref. 28485], Ferraris et al. 2017:[35] [ref. 35236], Koerber et al. 2017:68 [ref. 35267] with question). Current status: Synonym of Sternopygus macrurus (Bloch & Schneider 1801). Sternopygidae: Sternopyginae. Habitat: freshwater.