sawa, Tetragonopterus Castelnau [F. L.] 1855:65, Pl. 33 (fig. 1) [Animaux nouveaux or rares v. 2; ref. 766] Rio Crixás, rio Araguaia basin, Brazil. Holotype (unique): MNHN A-9819. Type catalog: Bertin 1948:17 [ref. 19577]. •Species inquirenda in Characidae -- (Reis et al. 2003:160 [ref. 27061]). •Synonym of Tetragonopterus argenteus Cuvier 1816 -- (Silva & Benine 2011:50 [ref. 31347] with comments, Litz & Koerber 2014:14 [ref. 33622], Mirande & Koerber 2015:23 [ref. 35117], Silva et al. 2016:11 [ref. 34929], Koerber et al. 2017:36 [ref. 35267]). Current status: Synonym of Tetragonopterus argenteus Cuvier 1816. Characidae: Tetragonopterinae. Habitat: freshwater.