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Issue: Vol. 642 No. 1: 13 Sept. 2004
Type: Article
Published: 2004-09-13
DOI: 10.11646/zootaxa.642.1.1
Page range: 1–10
Abstract views: 60
PDF downloaded: 4

A new killifish genus and species from the coastal plains of northeastern Brazil (Teleostei: Cyprinodontiformes: Rivulidae)

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, Brazil
Pisces Killifish Cyprinodontiformes Rivulidae Neotropica systematics taxonomy new genus new species

Abstract

Prorivulus auriferus, new genus and species, from the coastal plains of northeastern Brazil, is described. It is a member of a monophyletic unit, including Rivulus and the clade comprising all annual fish rivulid genera, diagnosed by two unambiguous synapomorphies: unossified interhyal and distal process of the second epibranchial absent. Prorivulus is hypothesized to be the sister group of the monophyletic assemblage including Rivulus and the clade comprising all annual fish rivulid genera, which is defined by four unambiguous synapomorphies: shortened uncinate process of the third epibranchial, articular face of the distal edge of first hypobranchial anteriorly expanded, ventral process of angulo-articular narrowed, and posterior flange of cleithrum absent. Prorivulus is distinguished from other basal rivulid taxa by having five branchiostegal rays.

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