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Issue: Vol. 5839 No. 2: 29 Jun. 2026
Type: Article
Published: 2026-06-29
DOI: 10.11646/zootaxa.5839.2.8
Page range: 372-380
Abstract views: 87
PDF downloaded: 6

A new species of Serrapinnus (Characiformes: Characidae: Cheirodontinae) from the rio Manso drainage, upper rio Paraguai basin, Mato Grosso, Brazil

Instituto de Biociências; Departamento de Biologia e Zoologia; Laboratório de Ictiologia da UFMT–CPUFMT; Universidade Federal de Mato Grosso - UFMT; Avenida Fernando Corrêa; 2367; Boa Esperança; 78060-900; Cuiabá; MT; Brazil.
Instituto de Biociências; Departamento de Biologia e Zoologia; Laboratório de Ictiologia da UFMT–CPUFMT; Universidade Federal de Mato Grosso - UFMT; Avenida Fernando Corrêa; 2367; Boa Esperança; 78060-900; Cuiabá; MT; Brazil.
Museu de Zoologia da Universidade Estadual de Londrina; Departamento de Biologia Animal e Vegetal; Centro de Ciências Biológicas; Rodovia Celso Garcia Cid; PR-445; Km 380 - Campus Universitário; 86057-970; Londrina; PR; Brazil.
Pisces Endemism Freshwater fish Neotropical fish rio Cuiabá Taxonomy

Abstract

We describe Serrapinnus mansoensis sp. nov., a new species of Cheirodontinae from a headwater stream of the rio Manso basin, upper rio Paraguai drainage, Mato Grosso, Brazil. The species is immediately distinguished from all congeners by the absence of any dark melanophore-based markings in live specimens, with both the midlateral stripe and caudal peduncle spot inconspicuously evidenced in alcohol preserved specimens by the presence of scarce and scattered melanophores. It further differs by having 7–9 cusps on premaxillary teeth (vs. 4–5 in S. microdon, and S. potiguar), 36–39 scales in the longitudinal series (vs. ≤35 in S. aster, S. calliurus, S. malabarbai, S. kriegi, S. micropterus, S. notomelas, and S. piaba), incomplete lateral line (vs. complete in S. heterodon), and 16–18 ventral procurrent caudal-fin rays (vs. 11–13 in S. zanatae). The discovery of this species in a small, clear-water headwater highlights the still underestimated diversity and endemism in the upper Paraguai basin and reinforces the conservation priority of these highland aquatic systems.

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How to Cite

Ribeiro, A.C., Ferreira, K.M. & Jerep, F.C. (2026) A new species of Serrapinnus (Characiformes: Characidae: Cheirodontinae) from the rio Manso drainage, upper rio Paraguai basin, Mato Grosso, Brazil. Zootaxa, 5839 (2), 372–380. https://doi.org/10.11646/zootaxa.5839.2.8