A new species of Hemigrammus is described from the middle rio Tocantins basin, central Brazil. The new species can be distinguished from all congeners by having a black midlateral stripe on the body extending from the posterior margin of the eye to the median caudal-fin rays. Mature males possess dorsal-, pelvic-, and anal-fin rays elongate, features that also help to recognize the new species. Although the new species is described in Hemigrammus, some specimens present a complete series of pored scales in the lateral line. A discussion about the generic allocation of the new species is presented. © 2014 Sociedade Brasileira de Ictiologia.
CITATION STYLE
Marinho, M. M. F., Dagosta, F. C. P., & Birindelli, J. L. O. (2014). Hemigrammus ataktos: A new species from the Rio Tocantins basin, Central Brazil (Characiformes: Characidae). Neotropical Ichthyology, 12(2), 257–264. https://doi.org/10.1590/1982-0224-20130091
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