Novas Ocorrências De Leporinus Pachycheilusbritsky, 1976 E Descrição De Uma Espécie Nova Do Mesmo Grupo Na Amazônia Brasileira (Osteichthyes, Anostomidae).

Abstract

The distribution area of Leporinus pachycheilusBritski, 1976 (Osteichthyes, Anostomidae), described from the Aripuanã river, is amplified to the Jamari and the Machado rivers, all tributaries of the Madeira river, and to the Uatumã, Araguari and Tocantins drainages. A complementary description of this species is given. Geographical variation on scales number was observed among diferent populations and a highly diverse color pattern at interpopulation and in-trapopulation levels. Leporinus juliin. sp., a new species close to L.pachycheilus,is decribed from Xingu and Trombetas drainage. This is a group of species restricted to the rapids of rivers draining Brazilian and Guianean shields and the uniques to present mouth completely inferior and incisiviform teeths, inserted side by side.