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Pareiorhina brachyrhyncha (Loricariidae: Siluriformes): A New Species of Fish from the Paraíba do Sul Slope of Serra da Mantiqueira, Southeastern Brazil

Carine C. Chamon, Arion T. Aranda and Paulo A. Buckup
Copeia
Vol. 2005, No. 3 (Aug. 2, 2005), pp. 550-558
Stable URL: http://www.jstor.org/stable/4098564
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Pareiorhina brachyrhyncha (Loricariidae: Siluriformes): A New Species of Fish from the Paraíba do Sul Slope of Serra da Mantiqueira, Southeastern Brazil
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Abstract

A new species of Pareiorhina is described from the Ribeirão Grande and adjacent drainages, in the left bank of the Rio Paraíba do Sul basin, in São Paulo State, southeastern Brazil. Pareiorhina brachyrhyncha is uniquely diagnosed among its congeners by the reduction or absence of azygous plates in front of the nuchal plate. It also differs from its congeners by the presence of a minute lateral cusp in the teeth, wider body, anterior and lateral profile of head rounded, broad distal profile of the paired fins, and lower number of vertebrae. The species is considered to be closely related to the sympatric P. rudolphi, based on the lack of azygous dorsal plates above the caudal peduncle. /// Uma nova espécie de peixe do gênero Pareiorhina é descrita do Ribeirão Grande e bacias adjacentes, na margem esquerda da bacia do Rio Paraíba do Sul, no Estado de São Paulo, sudeste do Brasil. Pareiorhina brachyrhyncha é diagnosticada de forma única entre seus congêneres pela redução ou ausência de placas ímpares em frente à placa nucal. Ela também difere de seus congêneres pela presença de minúsculas cúspides laterais nos dentes, corpo relativamente largo, perfil anterior e lateral da cabeça arredondado e porção distal das nadadeiras pares relativamente expandida, e menor número de vértebras. A espécie é considerada como proximamente relacionada a espécie simpátrica P. rudolphi, baseado no compartilhamento da ausência de placas ímpares sobre o pedúnculo caudal.

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