Abstract
A new species of Microglanis is described from the upper rio Tocantins basin, Barro Alto, Goiás State, Brazil. This species is distinguished from the others by presenting a unique color pattern, consisting of round spots in the flank between the larger dark brown blotches. Moreover, it can be distinguished by the combination of the following features: caudal fin emarginate, the upper lobe slightly larger than the lower, lateral line relatively long, reaching vertical through posterior margin of the pelvic fin, and light stripe on supra-occipital region absent or very narrow and with irregular shape.
Highlights
Microglanis Eigenmann, 1912 is a group of catfishes identified by the small size, incomplete lateral line, body with large dark brown blotches, and premaxillary tooth plate laterally rounded (Schultz, 1944; Gomes, 1946; Mees, 1974).The geographic distribution is very broad in South America, occurring in coastal rivers of the trans-Andean region of Peru and Ecuador, and in major watersheds of cis-Andean region (Shibatta, 2003)
Analyzing the collection of Microglanis of Instituto Nacional de Pesquisas da Amazônia (INPA), a new species was discovered from the upper rio Tocantins basin, rio dos Patos, Barro Alto
All measurements were presented as percents of standard length (SL), and the subunits of head were presented as percents of head length (HL)
Summary
Microglanis Eigenmann, 1912 is a group of catfishes identified by the small size (less than 8 cm SL), incomplete lateral line, body with large dark brown blotches, and premaxillary tooth plate laterally rounded (Schultz, 1944; Gomes, 1946; Mees, 1974). The Araguaia-Tocantins basin was only recently recognized as area of distribution of genus, with the description of three new species (Ruiz & Shibatta, 2010; Ruiz & Shibatta, 2011). To the rio Tocantins basin, only M. robustus Ruiz & Shibatta, 2010 was described to date, but with known distribution restricted to the region of Tucuruí hydroelectric power plant, in Jatobal, Pará State. Analyzing the collection of Microglanis of Instituto Nacional de Pesquisas da Amazônia (INPA), a new species was discovered from the upper rio Tocantins basin, rio dos Patos, Barro Alto. With the description of this new species, the number of known species of Microglanis (Jarduli & Shibatta, 2013) is increasing to 22, highlighting the AraguaiaTocantins basin as one of the richest in Microglanis species
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