duragenys, Hyphessobrycon Ellis [M. D.] 1911:155, Pl. 2 (fig. 3) [Annals of the Carnegie Museum v. 8 (no. 1, art. 2); ref. 1269] Rio Tietê at Mogy das Cruces, Brazil. Holotype: FMNH [ex CM 3023] (missing). Paratypes: (14) CAS 51792 [ex IU 13293 & CM 3024] (2), FMNH 54402-03 (5, 9). Type catalog: Henn 1928:65 [ref. 12305], Ibarra & Stewart 1987:48 [ref. 12367]. •Valid as Hyphessobrycon duragenys Ellis 1911 -- (Almirón & Casciotta 1999:344 [ref. 24405], Lima & Malabarba in Reis et al. 2003:135 [ref. 27061], Carvalho & Langeani 2013:526 [ref. 32913], Carvalho et al. 2014:247 [ref. 33371], Teixeira et al. 2016:474 [ref. 34088]). Current status: Valid as Hyphessobrycon duragenys Ellis 1911. Acestrorhamphidae: Hyphessobryconinae. Distribution: Upper Tietê and Paraíba do Sul River basins, Brazil. Habitat: freshwater.