A new species of the catfish genus Centromochlus (Siluriformes: Auchenipteridae: Centromochlinae) from the upper rio Paraná basin, Brazil

Abstract

Centromochlus comprises twelve species, distributed in the main inland watersheds of South America, including the Orinoco, Essequibo, coastal rivers of Suriname, Amazon, upper Paraná and São Francisco basins. The new species is described from the upper rio Paraná based on material collected in 1965 during the construction of the UHE Ilha Solteira, São Paulo, Brazil. The new species is easily distinguished from all congeners due to absence of adipose fin, a condition otherwise restricted to Gelanoglanis nanonocticolus, among centromochlin catfishes. The new species comprises small catfishes (adults ranging from 35 to 39 mm SL), in which modified anal fin of males is devoid of denticulations or spines, and most posterior rays reduced in length. In addition, Tatia simplex Mees is transferred to Centromochlus and its generic reassignment discussed.Centromochlus abriga doze espécies, com registros para os principais sistemas fluviais de águas interiores da América do Sul, como o Orinoco, Essequibo, rios costeiros do Suriname, Amazonas, alto Paraná e São Francisco. A nova espécie é descrita do alto rio Paraná, a partir de material coletado em 1965 durante a construção da UHE Ilha Solteira, São Paulo, Brasil. A espécie nova distingue-se facilmente de todas as suas congêneres pela ausência de nadadeira adiposa, uma condição até então restrita à Gelanoglanis nanonocticolus, dentre os bagres centromochlíneos. A nova espécie inclui pequenos bagres (adultos entre 35 e 39 mm CP), nos quais a nadadeira anal modificada em machos é desprovida de dentículos ou espinhos, e com os raios mais posteriores de tamanho reduzido. Adicionalmente, Tatia simplex Mees é transferida para Centromochlus e é fornecida uma discussão acerca de seu posicionamento genérico.

A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

“…Species of Centromochlus are widely distributed in South America, occurring in the Orinoco basin in Venezuela and Colombia, Amazon basin from Ecuador to Brazil, coastal rivers of northern South America between the mouths of the Orinoco and Amazon rivers and upper Paraná and São Francisco basins (Soares-Porto, 1998;Ferraris, 2003Ferraris, , 2007Akama & Sarmento-Soares, 2007;Sarmento-Soares & Buckup, 2005;Sarmento-Soares & Birindelli, 2015).…”

A new species of Centromochlus (Siluriformes, Auchenipteridae, Centromochlinae) from the middle Rio Tocantins basin, Brazil

“…Two species were more recently described in Centromochlus , Centromochlus macracanthus Soares‐Porto 2000 and Centromochlus meridionalis Sarmento‐Soares, Cabeceira, Carvalho, Zuanon & Akama 2013. In addition, two species were recently transferred to Centromochlus : Glanidium bockmanni Sarmento‐Soares & Buckup 2005 (Sarmento‐Soares & Martins‐Pinheiro, ) and Tatia simplex Mees 1974 (Sarmento‐Soares & Birindelli, ). Currently, a total of 13 species are considered valid in Centromochlus ; the type species of the genus, Centromochlus megalops , is considered as a species inquirendae (Ferraris, ).…”