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Type: Articles
Published: 2005-08-23
Page range: 57–64
Abstract views: 39
PDF downloaded: 3

Simpsonichthys nielseni sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the São Francisco River basin, 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, RJ, Brasil
Pisces Annual fish killifish Cyprinodontiformes Rivulidae Simpsonichthys São Francisco River systematics taxonomy new species

Abstract

Simpsonichthys nielseni, new species, is described from the middle São Francisco River basin, Brazil. It is a member of the S. notatus species group (which includes S. notatus, S. stellatus, S. similis, S. rufus, S. trilineatus, S. auratus, and S. radiosus), which is characterized by a derived pattern of frontal squamation. The new species differs from congeners by possessing a unique color pattern of the caudal fin in males, which includes six or seven light blue stripes diverging from the fin base, terminating in sharp tips on the fin margins. Simpsonichthys nielseni and S. stellatus share an apomorphic color pattern consisting of elongated light spots alternating with black zones on the dorsalfin base in males.

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