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Melanorivulus

21-3_Melanorivulus imperatrizensis

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Dalton Tavares Bressane Nielsen and Christian Silva Pinto: Melanorivulus imperatrizensis, a new species of killifish (Cyprinodontiformes: Rivulidae) from the rio Tocantins basin, Brazil, pp. 136-143

Abstract

Melanorivulus imperatrizensis, new species, collected in a small spring, at the middle rio Tocantins basin, northeast Brazil, is described. Melanorivulus imperatrizensis differs from all other species of the genus Melanorivulus by possessing all fins orange (vs. orange fins absent in other species of Mel­anorivulus or orange distal stripe on M. dapazi). The hypothesized close relationship between M. imperatrizensis and M. parnaibensis suggests a historical biogeographic relationship between Southern Amazonian tributaries and Rio Parnaíba.