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Resurrection of the Neotropical Pimelodid Catfish Parapimelodus nigribarbis (Boulenger), with a Phylogenetic Diagnosis of the Genus Parapimelodus (Teleostei: Siluriformes)

Carlos A. S. Lucena, Luiz R. Malabarba and Roberto E. Reis
Copeia
Vol. 1992, No. 1 (Feb. 3, 1992), pp. 138-146
DOI: 10.2307/1446545
Stable URL: http://www.jstor.org/stable/1446545
Page Count: 9
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Resurrection of the Neotropical Pimelodid Catfish Parapimelodus nigribarbis (Boulenger), with a Phylogenetic Diagnosis of the Genus Parapimelodus (Teleostei: Siluriformes)
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Abstract

Parapimelodus nigribarbis, from the laguna dos Patos system of southern Brazil, is resurrected from the synonymy of P. valenciennis, the latter species restricted to the La Plata basin (i.e., Paraguay, Uruguay and lower Paraná rivers). A lectotype for P. nigribarbis is designated. Parapimelodus is redefined based on three derived features: (1) presence of extremely long gill rakers, longer than the gill filaments on the first branchial arch; (2) more than 55 gill rakers on the first branchial arch; and (3) eyes very large and laterally located on the head, in such a way that they can be seen dorsally and ventrally. A brief discussion on delimitation of similar allopatric species is also included, suggesting that allopatric populations with consistent differences should be regarded as distinct species. /// Parapimelodus nigribarbis, do sistema da laguna dos Patos (sul do Brasil) é revalidada da sinonímia de P. valenciennis, restrita ao sistema do Prata (rios Paraguai, Uruguai e baixo Paraná). O gênero Parapimelodus é redefinido com base em três caracteres derivados: (1) presenca de rastros branquiais mais longos que os filamentos branquiais no primeiro arco branquial; (2) mais de 55 rastros branquiais no primeiro arco branquial; e (3) olhos muito grandes e lateralmente posicionados na cabeca, de tal forma que podem ser vistos dorsal e ventralmente. Uma breve discussão sobre delimitacão de espécies alopátricas semelhantes é também fornecida, sugerindo que populacões alopátricas com diferencas consistentes devem ser consideradas espécies distintas.

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