A new species of Chaetostoma (Siluriformes: Loricariidae) from the Orinoco basin with comments on Amazonian species of the genus in Colombia

[Karsten S.]

A new species of Chaetostoma (Siluriformes: Loricariidae) from the Orinoco basin with comments on Amazonian species of the genus in Colombia
Alexander Urbano‐Bonilla und Gustavo A. Ballen

Abstract
Chaetostoma chimu sp. nov. is described from 119 specimens collected in the Andean foothills of the Orinoco River in Colombia. The new species can be distinguished from congeners by a combination of characters, including shape of cheek odontodes, presence of a supraoccipital excrescence, sexual dimorphism characters, and color pattern. In addition, from the sympatric and geographically close congeners of the Orinoco that have curved cheek odontodes (i.e., C. anale, C. formosae, and C. joropo), by presenting a generally larger orbital diameter and interorbital distance, sexual dimorphism, and specific details of color pattern. We also clarify the type locality of specimens collected by Kjell von Sneidern in the mid‐20th century in the Colombian Amazon. We propose that C. alternifasciatum and C. vagum are junior synonyms of C. anale. We offer an identification key for the species of Chaetostoma from cis‐Andean drainages in Colombia. The new species as is herein categorized as Vulnerable (Vu) B1a (i, iii), following the IUCN criteria.

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Link (zugangsbeschränktes Paper)

Gruß,
Karsten