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Issue: Vol. 1052 No. 1: 20 Sept. 2005
Type: Articles
Published: 2005-09-20
DOI: 10.11646/zootaxa.1052.1.4
Page range: 41–48
Abstract views: 89
PDF downloaded: 10

Austrolebias univentripinnis sp. nov. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the Mirim Lagoon basin, southern Brazil

Laboratório de Ictiologia Geral e Aplicada, Departamento de Zoologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68049, CEP 21944-970, Rio de Janeiro, Brasil
Setor de Ictiologia, Divisão de Fauna, Grupo Especial de Estudo e Proteção do Ambiente Aquático do Rio Grande do Sul, Rua Tiradentes, 2247, CEP 96010-160, Pelotas, RS, Brasil
Pisces Fish Cyprinodontiformes Rivulidae Austrolebias Neotropica lagoa Mirim systematics taxonomy new species

Abstract

Austrolebias univentripinnis n. sp. is described from the Jaguarão River floodplains, Mirim Lagoon basin, southern Brazil. It is a member of a clade that also includes A. viarius, A. arachan, A. adloffi, A. charrua, A. minuano, A. nigrofasciatus, A. vandenbergi, A. bellottii, and A. melanoorus, which is diagnosed by the possession of a long and triangular anal fin in females. The new species is similar to A. bellottii and A. melanoorus in having the urogenital papilla completely attached to the anal fin in males; it differs from A. bellottii in having the dorsal fin more anteriorly placed in males, a shorter anal-fin base, lesser body depth, and wider basihyal; it is distinguished from A. melanoorus by the number of rostral neuromasts, degree of pelvic-fin fusion, morphology of dorsum in females, color pattern of unpaired fins in males, and color pattern of flank in both sexes.

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