Abstract Phenacorhamdia comprises 15 species distributed across the major river basins of South America,with P. tenebrosa beingthe only species recorded in Argentina. After the examination of specimens of Phenacorhamdia from the upper Bermejo River basin, Paraná River basin, in northwestern Argentina, we conclude that they belong to a new species which is described herein. The new species is distinguished from the remaining members of the genus by a combination of non-unique characters including: maxillary barbel surpassing the distal tip of the adpressed pectoral fin; light-brown background coloration of the body; the conical teeth; 41–42 vertebrae; iii–iv,7–9 anal-fin rays, among other features. The morphological analysis performed shows a clear distinction of the new species from congeners, and the greater genetic distance based on the gen COI between P. bermejo with P. tenebrosa, provides additional support for the recognition of the new species herein described.
Aguilera et al. (Wed,) studied this question.
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