Leporinus trimaculatus, a new species from Amazonia, Brazil, and redescription of the sympatric Leporinus aripuanaensis (Pisces, Characiformes, Anostomidae)

Leporinus trimaculatus n.sp. is described, and Leporinus aripuanaensis Garavello & Santos, 1981 is redescribed, both from the Aripuanã river basin, Mato Grosso state, Amazonia, Brazil. A colour pattern of two, three or more dark brown blotches on the lateral sides of the body in both species concerned, is considered a derived character for anostomid fishes of the genus Leporinus. The geographical distribution of blotched Leporinus species is discussed.