Description of a new species of Ituglanis (Siluriformes: Trichomycteridae) from Serra dos Carajás, rio Tocantins basin

A new species of Ituglanis is described from the rio Tocantins basin, State of Para, Brazil. Ituglanis ina, new species, is distinguished from its congeners by the presence of a dark vertical bar over the base of the caudal-fin rays (vs. no bars over caudal-fin base); and by the presence of a middle trunk line of tiny neuromasts extending along the flank until the vertical through the dorsal fin, or near the caudal-fin base (vs. no middle trunk line of tiny neuromasts). Ituglanis ina can be further distinguished by a combination of characters related to color pattern and morphology. Comments on the relationship between Ituglanis species are presented. Uma especie nova de Ituglanis e descrita da bacia do rio Tocantins, Para, Brasil. Ituglanis ina, especie nova, e facilmente diferenciada das congeneres por apresentar uma barra vertical escura sobre a base dos raios da nadadeira caudal (vs. sem barras na base da nadadeira caudal); e por apresentar linha lateral seguida por uma linha de diminutos neuromastos ate a regiao do flanco, abaixo da nadadeira dorsal, ou ate o pedunculo caudal (vs. sem neuromastos apos a linha lateral). Ituglanis ina distingue-se, tambem, por uma combinacao de caracteres relacionados ao padrao de coloracao e morfologia. Comentarios sobre o relacionamento das especies e grupos de especies de Ituglanis sao apresentados.

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