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10 September 2008 A New Species of Hemigrammus from the Upper Rio Tapajós Basin in Brazil (Teleostei: Characiformes: Characidae)
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Abstract

Hemigrammus silimoni is described from the Rio Juruena, upper Rio Tapajós basin, Mato Grosso State, Brazil. The new species is distinguished from all congeners, and in fact from the remaining Characidae, by the autapomorphic presence of an ocellus-like blotch on the caudal-fin dorsal lobe. The high level of fish endemicity in the Rio Juruena (upper Rio Tapajós basin) is discussed.

Descreve-se Hemigrammus silimoni, uma nova espécie do Rio Juruena, bacia superior do Rio Tapajós, Estado de Mato Grosso, Brasil. A nova espécie apresenta uma mancha elipsóide similar a um ocelo no lobo superior da nadadeira caudal, uma característica autapomórfica que a distingue de todas as demais espécies do gênero e mesmo de outras espécies de Characidae. O alto grau de endemismo de peixes no rio Juruena (bacia do alto rio Tapajós) é discutido.

2008 by the American Society of Ichthyologists and Herpetologists
Heraldo A. Britski and Flávio C. T. Lima "A New Species of Hemigrammus from the Upper Rio Tapajós Basin in Brazil (Teleostei: Characiformes: Characidae)," Copeia 2008(3), 565-569, (10 September 2008). https://doi.org/10.1643/CI-07-134
Received: 13 June 2007; Accepted: 1 November 2007; Published: 10 September 2008
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