Peridot tetra

description

is widespread in clear, running-water streams in the upper rios Paraguay, Tapajós and Araguaia-Tocantins drainages (Lima & Ribeiro, 2011). Jupiaba is a well corroborated monophyletic taxa (Zanata, 1997) and the remaining species of the group occurs in the upland amazonian tributaries from central Brazil. Similar distribution is reported for Knodus chapadae, from the upper portion of the upper rio Paraguay and from Tocantins basin (Ferreira, 2007). Our phylogeographyc analysis cared out in J. acanthogaster from 15 localities (Figs. 2 - 3) corroborate the hypothesis that tectonic origin of the upper rio Paraguay basin correspond to the most recent vicariant event in the evolutionary history of the area since samples from the rio Xingu basin are sister-group of a more inclusive clade encompassing the upper rio Tapajós and upper rio Paraguay. Thus, vicariance between the upper rio Paraguay and upper rio Tapajós is the least event in the biogeographic history of the group (Fig. 3). The mean nucleotide diversity (ð) was 0.001152 and the mean haplotype diversity (h) was 0.512167; values for each locality are shown in Table 2. The obtained sequences corresponded to 28 haplotypes and any co

Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland