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21 February 2008 A New Pelvicless Killifish Species of the Genus Rivulus, Subgenus Melanorivulus (Cyprinodontiformes: Rivulidae), from the Upper Tocantins River Basin, Central Brazil
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Abstract

Rivulus planaltinus, new species, from the Maranhão River drainage, upper Tocantins River basin, central Brazil, is described. It is a member of a subclade of the subgenus Melanorivulus endemic to the central Brazilian plateau, which is diagnosed by having ventral process of angulo-articular vestigial and flank intense greenish blue or greenish golden, to purplish blue above anal-fin base in males. The new species differs from all other species of the subgenus Melanorivulus by the absence or extreme reduction of pelvic fins and pelvic girdle, numerous vomerine teeth, and a wide basihyal.

Rivulus planaltinus, sp. n., da drenagem do rio Maranhão, bacia do alto rio Tocantins, Brasil central, é descrita. Ela é um membro de um sub-clado do subgênero Melanorivulus endêmico do planalto central brasileiro, o qual é diagnosticado por possuir processo ventral de ângulo-articular vestigial e flanco azul esverdeado intenso ou dourado esverdeado, a azul arroxeado acima da base da nadadeira anal em machos. A nova espécie difere de todas as outras espécies do subgênero Melanorivulus pela ausência ou redução extrema de nadadeiras pélvicas e cintura pélvica, dentes de vomer numerosos, e um largo basial.

2008 by the American Society of Ichthyologists and Herpetologists
Wilson J. E. M. Costa and Gilberto C. Brasil "A New Pelvicless Killifish Species of the Genus Rivulus, Subgenus Melanorivulus (Cyprinodontiformes: Rivulidae), from the Upper Tocantins River Basin, Central Brazil," Copeia 2008(1), 82-85, (21 February 2008). https://doi.org/10.1643/CI-07-079
Received: 4 April 2007; Accepted: 1 August 2007; Published: 21 February 2008
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