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Article
Published: 2020-02-21

A new Corydoras (Ostariophysi: Siluriformes: Callichthyidae) with an unusual sexual dimorphism from the rio Juruena basin, Brazil

Museu de Zoologia da Universidade Estadual de Campinas “Adão José Cardoso”, Caixa Postal 6109, 13083-863, Campinas, SP, Brazil.
Museu Nacional, Universidade Federal do Rio de Janeiro, Depto. de Vertebrados, Setor de Ictiologia, Quinta da Boa Vista s/n, 20940-040 Rio de Janeiro, RJ, Brazil.
Pisces Corydoras atropersonatus Corydoras griseus Corydoras sychri Rio Tapajós Amazon basin

Abstract

A new Corydoras is described from the rio Juruena system, upper rio Tapajós drainage, Amazon basin, Brazil. The new Corydoras is distinguished from all congeners by presenting a combination of a conspicuous broad vertical dark bar on head, at the level of the eye (mask), an overall light background color without large blotches or stripes on body or fins, the presence of two to four small dark blotches along the midline, and pectoral spine with antrorse serrations on its posterior margin. Males of the new species possess numerous, well-developed odontodes over the lateral portions of head, pectoral girdle, and pectoral spines, an uncommon feature for the genus. The new species is hypothesized to belong, within the genus Corydoras, either to Lineage 6 or Lineage 9.

 

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How to Cite

LIMA, F. C., & BRITTO, M. R. (2020). A new <em>Corydoras</em> (Ostariophysi: Siluriformes: Callichthyidae) with an unusual sexual dimorphism from the rio Juruena basin, Brazil. Zootaxa, 4742(3), 518–530. https://doi.org/10.11646/zootaxa.4742.3.6