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Issue: Vol. 5497 No. 3: 26 Aug. 2024
Type: Article
Published: 2024-08-26
DOI: 10.11646/zootaxa.5497.3.7
Page range: 426-434
Abstract views: 370
PDF downloaded: 12

A new species of the Cambeva variegata group (Siluriformes: Trichomycteridae) from the Serra do Espinhaço, south-eastern Brazil, under severe risk of extinction

Laboratory of Systematics and Evolution of Teleost Fishes; Institute of Biology; Federal University of Rio de Janeiro; Rio de Janeiro; Brazil
Programa de Pós-graduação em Biodiversidade; Ecologia; e Conservação; Universidade Federal do Tocantins; Porto Nacional; Tocantins; Brazil
Laboratório de Sistemática e Ecologia de Organismos Aquáticos; Centro de Ciências de Chapadinha; Universidade Federal do Maranhão; Chapadinha; Maranhão; Brazil
Laboratory of Systematics and Evolution of Teleost Fishes; Institute of Biology; Federal University of Rio de Janeiro; Rio de Janeiro; Brazil
Laboratory of Systematics and Evolution of Teleost Fishes; Institute of Biology; Federal University of Rio de Janeiro; Rio de Janeiro; Brazil
Pisces Cerrado Mountain biodiversity upper Rio São Francisco basin

Abstract

The mountain ranges of southeastern and southern Brazil are inhabited by a great diversity of catfishes of the genus Cambeva. The Cambeva variegata group, diagnosed by having a prominent skin crest similar to an adipose fin, an interrupted supraorbital laterosensory canal, with an additional supraorbital S4 pore, and a relatively small premaxilla with an accentuated constriction on its lateral portion, occurs in a broad area of south-eastern Brazil, mostly within the savannah-like Cerrado vegetation at the northern-most part of the genus distribution. The new species described here was collected in streams of the Rio das Velhas drainage, Rio São Francisco basin, draining the Serra do Espinhaço. The new species is diagnosed by having more interopercular odontodes and a combination of morphometric data, colour pattern, relative dorsal-fin origin and vertebra position, and-fin-ray morphology. Field studies indicate that the two localities where the new species occur are being dramatically affected by negative human impacts, putting it in severe risk of extinction.

 

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