Revisão taxonômica das espécies de Hisonotus Eigenmann & Eigenmann (Siluriformes: Loricariidae) da bacia do rio Uruguai e o sistema da laguna dos Patos

• Ano de defesa: 2008
• Autor(a) principal: Carvalho, Tiago Pinto
• Orientador(a): Reis, Roberto Esser dos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ICTIOLOGIA; ZOOLOGIA; PEIXES - RIO GRANDE DO SUL
• Link de acesso: http://hdl.handle.net/10923/5372

The genus Hisonotus presents about 25 valid species, and is a group of hypoptopomatines widely distributed in the southeastern basins of South America. Among these basins, presenting a high number of species are the rio Paraná basin with seven species the rio Uruguai with eight species and the laguna dos Patos system with 12 species. The main scope of this study is review the taxonomic composition of the genus in the laguna dos Patos system and in the rio Uruguai basin. The rio Uruguai basin presents the following species of Hisonotus: H. nigricauda, H. ringueleti, H. aky, H. charrua, and the new species herein described, H. sp. “Chapecó”, H. sp. “Passo Fundo”, H. sp. “Ariranhas”, and H. sp. “Canoas”. In this review H. candombe is synonym of H. ringueleti and Epactionotus aky is transferred to the genus Hisonotus. The laguna dos Patos system presents the following species: H. nigricauda, H. laevior, H. taimensis, H. armatus, H. charrua, H. aff. leucofrenatus, and the new species, H. sp. “Camaquã”, H. sp. “Sinos”, H. sp. “Felício”, H. sp. “Prata”, H. sp. “Carreiro” and H. sp. “Passo Novo”. Hisonotus laevior and H. nigricauda are redescribed, and H. leptochilus is synonym of the first. Among the 18 species present in the studied region, just one (H. aff. leucofrenatus) is found in other basins, and two (H. nigricauda e H. charrua) are shared between both drainages studied here, suggesting a high degree of endemism of these areas.