Abstract
ABSTRACT A new species of Phenacogaster is described from the rio Salitre, a tributary of the lower middle rio São Francisco drainage. The new species can be clearly distinguished from all its congeners in having a conspicuous, broad caudal peduncle spot reaching the upper and lower margins of the peduncle with a short extension onto the middle caudal fin rays and another weaker extension over the lower lobe of the caudal fin.
Highlights
The monophyletic genus Phenacogaster Eigenmann currently comprises 22 species distributed throughout the river basins of Amazon, Orinoco, Tocantins, Paraguay, and São Francisco; the coastal rivers of northern and northeastern Brazil and the Guianas (Lucena, Malabarba, 2010; Antonetti et al, 2018); and the middle rio Paraná basin (Casciotta et al, 2003).To date, the only species of the genus mentioned from the rio São Francisco drainage is Phenacogaster franciscoensis, which was described by Eigenmann (1911) based on specimens obtained from “Boqueiras, near mouth of Rio Porto (=Preto)” (Lucena, Malabarba, 2010)
The only species of the genus mentioned from the rio São Francisco drainage is Phenacogaster franciscoensis, which was described by Eigenmann (1911) based on specimens obtained from “Boqueiras, near mouth of Rio Porto (=Preto)” (Lucena, Malabarba, 2010)
We describe the second species of the genus from that drainage based on samples collected 21 years ago from the rio Salitre basin
Summary
The monophyletic genus Phenacogaster Eigenmann currently comprises 22 species distributed throughout the river basins of Amazon, Orinoco, Tocantins, Paraguay, and São Francisco; the coastal rivers of northern and northeastern Brazil and the Guianas (Lucena, Malabarba, 2010; Antonetti et al, 2018); and the middle rio Paraná basin (Casciotta et al, 2003). The only species of the genus mentioned from the rio São Francisco drainage is Phenacogaster franciscoensis, which was described by Eigenmann (1911) based on specimens obtained from “Boqueiras, near mouth of Rio Porto (=Preto)” (Lucena, Malabarba, 2010). In the Results section, the catalog number of the paratypes is followed by the total number of specimens in the lot, the range of standard lengths the number of specimens that were counted and measured, and the respective range of standard lengths (in parentheses)
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