Wednesday, March 16, 2016

[Ichthyology • 2016] Corydoras eversi • A New Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about C. araguaiaensis

Corydoras eversi 
 Tencatt & Britto, 2016 

A new species of Corydoras is described from the rio Araguaia basin, Goiás, Brazil. The new species can be distinguished from its congeners by presenting the following features: infraorbital 1 with very large ventral laminar expansion; infraorbital 2 contacting compound pterotic; flanks densely covered by irregular black spots; and ventral surface of trunk densely covered by coalescent relatively well-developed platelets. It is also discussed the possibility that C. araguaiaensis comprehends a complex of species.

Keywords: C65, Corydoradinae, Corydoras sp. “Guaraná”, Goiás State, Taxonomy.

Distribution. Corydoras eversi is known from its type locality, an unnamed stream tributary to the rio Araguaia (Fig. 6).

Ecological notes. The specimens examined herein were captured in a clear water stream, with sandy ground and fast flowing. After capture the specimens are light orange. This color remains in aquarium when the water conditions are adequate to its biological aspects. In the type locality of the new species no other congener were observed in syntopy (H.-G. Evers pers. comm.).

Etymology. Corydoras eversi is named in honor of Hans-Georg Evers, a dear friend and great enthusiast in the fishkeeping hobby, especially in the breeding of Corydoras species. Hans collected the specimens of C. eversi that apparently originated all the stock present in the hobby until the present day and also the specimens used herein for the description.

Luiz Fernando Caserta Tencatt and Marcelo Ribeiro de Britto. 2016. A New Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about Corydoras araguaiaensis Sands, 1990Neotropical Ichthyology. 14(1): e150062. DOI: 10.1590/1982-0224-20150062

Uma espécie nova de Corydoras é descrita da bacia do rio Araguaia, Goiás, Brasil. A espécie nova pode ser distinguida de suas congêneres por apresentar as seguintes características: infraorbital 1 com expansão laminar ventral muito grande; infraorbital 2 em contato com o pterótico composto; flancos densamente cobertos por manchas pretas irregulares e superfície ventral do tronco densamente coberta por plaquetas coalescentes relativamente bem desenvolvidas. Discute-se também a possibilidade de C. araguaiaensis compreender um complexo de espécies.