[Article]A New Species of Hemigrammus from the Upper Rio Tapajós Basin in Brazil

Bristskii A., Lima FCT. 2008. A New Species of Hemigrammus from the Upper Rio Tapajós Basin in Brazil (Teleostei: Characiformes: Characidae). Copeia 2008(3): 565–569

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.

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