Evidências morfológicas e moleculares revelam duas novas espécies de Cambeva (Siluriformes: Trichomycteridae) na bacia do rio Paraná, Paraná, Brasil.

Abstract

In the state of Paraná, the Paraná river basin can be divided into two ecoregions: lower and upper Paraná river. In both ecoregions Cambeva species occur that are morphologically distinct from other currently described congeners. Since species of the genus are known for their high variation in color pattern, the use of molecular markers is an important tool to assist in species delimitation. Thus, two new Cambeva species are described using internal and external morphological analyses and DNA barcode molecular analyses based on the mitochondrial COI gene marker. The results indicated differences in color patterns and genetic divergence between the two morphotypes and in relation to other Cambeva species. Although they occur in the same river basins, the two new species are not found at the same collection sites, with Cambeva sp. 1 having a broader geographic distribution and Cambeva sp. 2 a more restricted distribution.