NOVAS OCORRÊNCIAS DE Leporinus pachycheilusBRITSKY, 1976 E DESCRIÇÃO DE UMA ESPÉCIE NOVA DO MESMO GRUPO NA AMAZÔNIA BRASILEIRA (OSTEICHTHYES, ANOSTOMIDAE).

Abstract

RESUMO -A área de distribuição de Leporinus pachycheilusBritski, 1976 (Teleostei, Anostomidae), descrita do rio Aripuanã, é ampliada para os rios Jamari e Machado, ambos afluentes do Madeira, assim como para os rios Uatumã, Araguari e Tocantins. Esta espécie apresenta alta variabilídade intra e inter-populacional no padrão de colorido, mas a consistência dos caracteres morfológicos indica que se trata de um grupo bem definido e não distinto do material descrito para a localidade tipo (rio Aripuanã). Uma nova espécie (Leporinus julii sp.n.) é descrita para os rios Xingu e Trombetas. Esta é muito semelhante a L. pachycheilus, mas difere basicamente pelo maior número de escamas ao redor do pedúnculo caudal (16 contra 12) e pelo padrão de colorido, formado por manchas arredondadas, ao invés de listras longitudinais. Ambas as espécies são restritas a trechos de corredeiras de rios que drenam os escudos das Guianas e do Brasil Central e são as únicas espécies de anostomídeos da Amazônia que apresentam boca totalmente inferior e dentes incisiviformes, dispostos lado a lado. Palavras-chaves:Peixes, Anostomidae, Taxonomia, Amazônia. Britski, 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 intrapopulation levels. Leporinus julii n. 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. New Occurence of Leporinus pachycheilus Britski, 1976 and a Description of a New Species of the Same Group in the Brazilian Amazon (Osteichthyes, Anostomidae). ABSTRACTS -The distribution area of Leporinus pachycheilus

Phylogenetic relationships within the South American fish family Anostomidae (Teleostei, Ostariophysi, Characiformes)

“…Following Winterbottom's (1980) study of the assemblage that he recognized as the Anostominae, Santos & Jégu (1987) described two new species of Sartor and Sidlauskas & Santos (2005) described a new species of Pseudanos . Abramites (Vari & Williams, 1987) and Laemolyta (Mautari & Menezes, 2006) have been revised fully, while partial revisions have been undertaken for Anostomoides (Santos & Zuanon, 2006), Hypomasticus (Santos, Jégu & Lima, 1996) Leporinus (Garavello, 1988; Garavello & Britski, 1988; Géry, Planquette & Le Bail, 1988; Garavello, 1989, 1990; Santos & Jégu, 1996), Rhytiodus (Géry, 1987) and Schizodon (Bergmann, 1988); Garavello & Britski, 1990; Vari & Raredon, 1991; Sidlauskas, Garavello & Jellen, 2007). Nonetheless, most genera and subgenera outside of Winterbottom's Anostominae, including the most species‐rich taxa (e.g.…”

A new species of Astyanax (Characiformes: Characidae) from the rapids of the lower rio Xingu, Brazil

“…Among small characids, Astyanax dnophos shares with some Hyphessobrycon species (those pertaining to the "Hyphessobrycon agulha" and "Hyphessobrycon heterorhabdus" species-groups; Géry, 1977) Rheophily is known among South American freshwater fishes in Anostomidae (Santos & Jégu, 1987;Santos et al, 1996), Crenuchidae (Buckup, 1993), Characidae (subfamily Serrasalminae: Jégu & Santos, 1988;Jégu, 1992;Jégu et al, 1992;Jégu & Santos, 2002;Jégu et al, 2002a;Jégu et al, 2002b), Sternopygidae (Schwassmann & Carvalho, 1985), Batrachoididae (Collette, 1995), and Cichlidae (Kullander, 1988;Zuanon & Sazima, 2002). Many Loricariidae are also obviously rheophilic (e.g., Zuanon, 1999).…”

Diet and ecomorphology of Leporinus reticulatus (Characiformes: Anostomidae) from the upper Rio Juruena, MT, Brazil: ontogenetic shifts related to the feeding ecology

“…The representatives of this genus are widely distributed from southern Central America to southern South America (Garavello and Britski 2003), with the Rio Amazonas basin holding the largest diversity and endemism of species. Some species of Leporinus reach approximately 40 cm of standard length (Garavello and Britski 2003), and are very important economically as food resource, other small-sized species has great economic importance in fish hobbyist industry (Santos et al 1996). In general, this genus has been consistently threatened by deleterious anthropic impacts, as the recent construction of dams in Amazonian rivers for energetic purposes (Agostinho et al 2007;ANEEL 2015).…”