gracilior, Serrasalmo humeralis var. Eigenmann [C. H.] 1915:257, Fig. 9 [Annals of the Carnegie Museum v. 9 (nos 3-4); ref. 1232] Rio Guaporé at Maciél, Brazil. Syntypes: FMNH 56977 [ex CM 5791] (now 3). Type catalog: Henn 1928:69 [ref. 12305] as 2 specimens, Ibarra & Stewart 1987:79 [ref. 12367]. •Synonym of Serrasalmus rhombeus (Linnaeus 1766) -- (Jégu in Reis et al. 2003:192 [ref. 27061], Ota et al. 2024:427 [ref. 40817]). Current status: Synonym of Serrasalmus rhombeus (Linnaeus 1766). Serrasalmidae: Serrasalminae. Habitat: freshwater.