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20 (4)_Austrolebias bagual

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Volume 20, Issue 4 – 15 October 2014

Matheus Vieira Volcan, Luis Esteban Krause Lanés and Ândrio Cardozo Gonçalves: Austrolebias bagual, a new species of annual fish (Cyprinodontiformes: Rivulidae) from southern Brazil, pp. 161-172

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SINGLE PAPER

Volume 20, Issue 4 – 15 October 2014

Matheus Vieira Volcan, Luis Esteban Krause Lanés and Ândrio Cardozo Gonçalves: Austrolebias bagual, a new species of annual fish (Cyprinodontiformes: Rivulidae) from southern Brazil, pp. 161-172

Abstract

Austrolebias bagual, a new species of annual fish closely related to the A. adloffi species group, is described from specimens collected from temporary ponds located in the middle course of the Rio Camaquã, Laguna dos Patos system at the municipality of Encruzilhada do Sul, Rio Grande do Sul, Brazil. The new species is distinguished from other Austrolebias species by the unique male pigmentation pattern of the dorsal fin, with black vertical bars elongated from the base to the medial portion of the fin, and by the pattern of transversal black bars on the body, which become gradually shorter and fainter towards caudal peduncle. It is also distinguished from all species of the A. adloffi species group by the lower body depth and head (except in A. rei­cherti), lower anal fin base length and caudal fin length in males, and the lower head depth (except in A. reicherti) and anal fin base length in females. In addition, A. bagual females do not have the pair of black spots arranged vertically in close proximity on the posterior portion of caudal peduncle typical of most species of the A. adloffi group.

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