Mylesinus is a genus of serrasalmids from South America, where found in the eastern Amazon, Essequibo and Orinoco basins. They are rheophilic, typically found at rapids and mainly feed on Podostemaceae plants. Because of their habitat preference, they are threatened by the building of dams. They reach up to in standard length, and the adult males have a double-lobed anal fin and several filamentous extensions on the dorsal fin. Species There are three recognized species: Mylesinus paraschomburgkii Jégu, dos Santos & E. J. G. Ferreira, 1989 Mylesinus paucisquamatus Jégu & dos Santos, 1988 Mylesinus schomburgkii Valenciennes, 1850 References Serrasalmidae Taxa named by Achille Valenciennes Fish of South America