orbignyanus, Myletes Valenciennes [A.] in Cuvier & Valenciennes 1850:220 [Histoire naturelle des poissons v. 22; ref. 1014] Above Corrientes, Rio Paraná, Brazil. Lectotype: MNHN A-9863 (230 mm SL specimen, stuffed). Paralectotype: MNHN A-9863 (1, same cat.# as Lectotype). Type catalog: Bertin 1948:28 [ref. 19577]. Lectotype selected by Géry et al. 1987:444 [ref. 6001]. •Synonym of Mylossoma duriventris (Cuvier 1818), but a valid subspecies orbignyanum (Cuvier 1818) -- (Gómez & Chebez 1996:52 [ref. 23791]). •Valid as Myletes orbignyanus Valenciennes 1850 -- (Britski et al. 1999:62 [ref. 24147], López et al. 2003:34 [ref. 27366], Menni 2004:79 [ref. 28131]). •Synonym of Mylossoma duriventre (Cuvier 1818) -- (Jégu in Reis et al. 2003:187 [ref. 27061], Litz & Koerber 2014:9 [ref. 33622], Mirande & Koerber 2015:15 [ref. 35117], Koerber et al. 2017:22 [ref. 35267], Mateussi et al. 2018:293 [ref. 35820], Ota et al. 2024:417 [ref. 40817]). Current status: Synonym of Mylossoma duriventre (Cuvier 1818). Serrasalmidae: Colossomatinae. Habitat: freshwater.