A new species of Astyanax (Characiformes, Characidae) from the rio Apiac ás, rio Teles Pires basin, with a discussion on its phylogenetic position

Canadian Journal of Zoology, Ahead of Print. A new species of Astyanax Baird& Girard, 1854 is described from the rio Apiac ás, a tributary of the rio Teles Pires, rio Tapajós basin, Mato Grosso state, Brazil. The new taxon can be distinguished from all congeners, except those belonging to the Astyanax bimaculatus species group and to the Astyanax orthodus species group, by the presence of a horizontally elongated to r ounded humeral blotch. The new taxon can be readily distinguished from all species belonging to the A. bimaculatus species group and to the A. orthodus species group by presenting a distinct morphology in premaxillary and dentary teeth with conspicuous diastema (a teeth gap) between them. We also pr esent a hypothesis about the phylogenetic relationships of the new taxon within Astyanax.
Source: Canadian Journal of Zoology - Category: Zoology Authors: Source Type: research