Abstract
Glanidium botocudo, new species, is described from the tributaries to the upper rio Doce and Mucuri, eastern Minas Gerais State, Brazil. It represents the northernmost record of a centromochlin catfish from the coastal rivers of the Northeastern Atlantic Forest. Glanidium botocudo is readily distinguished from its congeners, except Glanidium albescens, by the whitish grey body coloration with evenly spaced small dark brown dots. The new species has a long sharpened ventral process on the urohyal, an uncommon condition among congeners, and the lowest vertebral count among the large-sized Glanidium, 36-37. It differs from Glanidium albescens by proportional measurements and higher number of ribs. Glanidium botocudo and Glanidium albescens are probably sister species, exhibiting similar morphological features and a complimentary distribution pattern, associated to an allopatric distribution pattern. Glanidium bockmanni is transferred to the genus Centromochlus
Highlights
Fishes of the auchenipterid subfamily Centromochlinae are spread throughout cis-Andean South America, and comprise the genera Centromochlus Kner, Tatia MirandaRibeiro, Glanidium Lütken, and Gelanoglanis Böhlke.Glanidium contains seven recognized species, ranging from coastal rivers along Suriname to river systems draining the laguna dos Patos system in southern Brazil (Akama & Sarmento-Soares, 2007; Ferraris, 2007)
In the present paper we describe a new species of Glanidium from eastern coastal rivers of the Brazilian Floresta Atlântica
Glanidium is recognized as a monophyletic clade and regarded as the sister group to other centromochlin genera (Soares-Porto, 1998; Birindelli, 2010)
Summary
Fishes of the auchenipterid subfamily Centromochlinae are spread throughout cis-Andean South America, and comprise the genera Centromochlus Kner, Tatia MirandaRibeiro, Glanidium Lütken, and Gelanoglanis Böhlke.Glanidium contains seven recognized species, ranging from coastal rivers along Suriname to river systems draining the laguna dos Patos system in southern Brazil (Akama & Sarmento-Soares, 2007; Ferraris, 2007). Two species inhabit upper and middle portions of rio São Francisco drainage, Glanidium albescens Lütken and Glanidium bockmanni Sarmento-Soares & Buckup. In the Brazilian coastal rivers between southern Espírito Santo and Rio Grande do Sul there are two species, Glanidium melanopterum Miranda Ribeiro, described from upper rio Paraíba do Sul, and Glanidium catharinensis Miranda Ribeiro, described from a coastal Santa Catarina river basin. These two species are in need of further investigation regarding their identity and limits of distribution
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