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.
Highlights
Centromochlus is a member of the family Auchenipteridae and, together with Gelanoglanis, Glanidium and Tatia, compose the subfamily Centromochlinae (Ferraris, 2007)
Three species of Centromochlinae occur in the upper rio Paraná basin: Tatia neivai (Ihering, 1930), Glanidium cesarpintoi, and Centromochlus britskii, described
Tatia neivai was described based on the unique holotype that is currently lost (Britski, 1969), and recently redescribed (Sarmento-Soares & Martins-Pinheiro, 2008)
Summary
Centromochlus is a member of the family Auchenipteridae and, together with Gelanoglanis, Glanidium and Tatia, compose the subfamily Centromochlinae (Ferraris, 2007). Centromochlus was proposed by Kner (1858) to encompass his new species C. megalops and C. aulopygius, the former designated by Bleeker (1862) as the type species. A comprehensive phylogenetic analysis of Centromochlinae (Soares-Porto, 1998) supported C. existimatus and C. heckelii as sister species derived within a clade that included species previously assigned to Gelanoglanis and Tatia.
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