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Issue: Vol. 465 No. 1: 16 Mar. 2004
Type: Article
Published: 2004-03-16
DOI: 10.11646/zootaxa.465.1.1
Page range: 1–12
Abstract views: 69
PDF downloaded: 4

Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes:Rivulidae): two new species from the upper Rio
Negro, Brazilian Amazon

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
Pisces Fish Cyprinodontiformes Rivulidae Rivulus Neotropica Amazon systematics taxo-nomy new species

Abstract

Rivulus uakti, new species, and R. amanapira, new species, from the upper rio Negro drainage, Amazonian basin, northern Brazil, are described. Both species are members of an assemblage, herein denominated R. atratus species group, that includes R. atratus, R. ornatus, R. rectocaudatus, R. romeri and R. tecminae, and is diagnosed by a unique pattern of frontal squamation and a derived color pattern of infraorbital region. The two new species seems to be closely related to R. romeri and R. tecminae by the absence of dermosphenotic and preopercular canal. Rivulus uakti is similar to R. tecminae and R. altivelis by having long pelvic fins, and differs from them by the fewer scales on the longitudinal series and a distinct female color pattern. Rivulus amanapira, similar to R. tecminae and R. rectocaudatus by having a truncate caudal fin in males, is diagnosed by the higher number of scales on the longitudinal series and unique color pattern of males.

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