It is proposed in this paper realize the taxonomic revision of the monotypic genus Paratrygon Duméril, 1865 through morphological analysis of specimens distributed throughout its range, now known to the Amazon and Orinoco basins. His species, Paratrygon aiereba (Müller & Henle, 1841), has a wide geographical distribution and populations distributed along this stretch have morphological differences, most evident in their coloration patterns of dorsal disc and morphology and distribution of dermal denticles. Through a preliminary analysis from the first specimens available (around 70 copies) in the Museu de Zoologia of USP (MZUSP) and the Instituto de Biociências (IBUSP) it was possible to distinguish, with observations on the characters specified above, two new probable species to gender, one from the upper sub-basin of the Araguaia and one of the upper Rio Tocantins. Even populations of P. aiereba from Amazonian rivers close to each other present a considerable diversity of coloration. Thus, this project aims to test the possible morphological separation of populations of P. aiereba found with molecular analysis. As the genus is little known to the morphological point of view, we propose a detailed anatomical review that may provide support for the taxonomic revision of Paratrygon. Thus, new morphological, taxonomic, geographic and phylogenetic date be raised about the evolution of this genus.
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