A new tetra of the genus Astyanax (Characiformes: Acestrorhamphidae) with lateral stripes from lower Amazon basin, Brazil

A new species of Astyanax is described from the rio Jauari and rio Mulato basins, tributaries of the left bank of the lower Amazon River, Pará State, Brazil. The new species is distinguished from the other congeners, except A. kullanderi, A. lineatus, and A. superbus, by presenting chromatophores concentrated on the edges of scales on the sides of the body, forming dark, wavy longitudinal stripes along the flanks. The new species can be diagnosed from A. kullanderi, A. lineatus, and A. superbus by having a greater number of gill rakers in the first branchial arch, body proportions, and color pattern. Among all congeners, the new species is most morphologically similar to A. lineatus. This is the first species of the genus to be described from tributaries of the northern bank of the lower Amazon basin.

Keywords:
Astyanax bimaculatus; Astyanax lineatus; Calha Norte Paraense; Taxonomy