One species, two basins: a new Hyphessobrycon (Characiformes: Acestrorhamphidae) from the upper rio Juruena and rio Guaporé basins, Mato Grosso, Brazil

This is the authors' abstract. We don't add key points for this paper.

A new species is described from the upper rio Juruena and rio Guaporé basins from the Chapada dos Parecis, Mato Grosso State, Brazil. The new speciescan be distinguished from all its congeners by the absence of both a humeral spot and a caudal-peduncle blotch and by the anal fin with 15–18 branched rays. Populations from Juruena and Guaporé river basins exhibit subtle differences in body proportions, coloration, and dentition; however, in our assessment, these variations are insufficient to warrant recognition as distinct species. The putative evolutionary relationships and historical biogeography of the species are discussed.