Abstract
Astyanax goyacensis Eigenmann, 1908 is redescribed based on the holotype and 25 topotypes. The species belongs to the A. bimaculatus species complex, sharing with those species a black, horizontally ovate, humeral spot (the most conspicuous feature of this complex), two diffuse vertical brown bars in the humeral area (the first through humeral spot and the second 2-3 scales behind), and black medium caudal-fin rays. Furthermore, A. goyacensis possesses a black stripe extending along midlateral body portion, more conspicuous in alcohol preserved specimens. These characteristics allow its inclusion in the putative "black lateral stripe" sub-group of A. bimaculatus species complex. From the species of this complex it differs by the black lateral stripe shape, pattern of chromatophores on the flank, coloration of the caudal fin, scales on the lateral line, branched rays on anal fin, eye diameter, and caudal peduncle depth. Comments about the color pattern in Astyanax bimaculatus species complex are added.
Highlights
Astyanax goyacensis Eigenmann, 1908 is a poorly known species, described based on a single specimen from “Goyaz”, collected by “Honorio”
There is not an appropriate taxonomic characterization of A. goyacensis, resulting in difficult species identification. This difficulty is increasing by the fact that A. goyacensis belongs to the Astyanax bimaculatus species complex, a very diverse group constituted by various very similar and probably phylogenetically very close species that need to be characterized thoroughly
A. goyacensis possesses a black stripe extending along midlateral body portion, deeper along caudal-peduncle and extending through medium caudal-fin-rays, more conspicuous in alcohol preserved specimens
Summary
Astyanax goyacensis Eigenmann, 1908 is a poorly known species, described based on a single specimen from “Goyaz”, collected by “Honorio”. There is not an appropriate taxonomic characterization of A. goyacensis, resulting in difficult species identification. This difficulty is increasing by the fact that A. goyacensis belongs to the Astyanax bimaculatus species complex, a very diverse group constituted by various very similar and probably phylogenetically very close species that need to be characterized thoroughly. A. goyacensis possesses a black stripe extending along midlateral body portion, deeper along caudal-peduncle and extending through medium caudal-fin-rays, more conspicuous in alcohol preserved specimens. These characteristics allow its inclusion in the putative “black lateral stripe” sub-group of the A. bimaculatus species complex, as recognized by. In recent collections in the rio Vermelho 20 topotypes of A. goyacensis were captured which, along with the holotype and the five other topotypes previously collected, compose a good series to support the redescription presented
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