Seven new species of the catfish genus Trichomycterus (Teleostei: Siluriformes: Trichomycteridae) from Southeastern Brazil and redescription of T. brasiliensis

Seven new species of the catfish genus Trichomycterus are described and Trichomycterus brasiliensis is redescribed from tributaries of the Rio Itabapoana, Sao Francisco and Paraiba do Sul river basins, southeastern Brazil. Trichomycterus macrotrichopterus, new species, is diagnosed by autapomorphic characters: morphology of the metapterygoid, wide and square-shaped, junction between meta pterygoid and hyomandibula forming high wave-shaped wall, and larger pectoral-fin filament, about 60 % of pectoral-fin length. Trichomycterus brunoi, T. anticline, T. fuliginosus, T. mariamole, T. novalimensis, T. rubiginosus, all new species, and T. brasiliensis are diagnosed by the morphology of the suspensorium bones, relative position of the pelvic-fin base, and the origin of dorsal and anal fins, number of branchiostegal-rays, size of the pectoral filament, number of vertebrae and pleural ribs, width of the body and colour pattern. A new diagnostic feature proposed for the T. brasiliensis species-complex, the opercular odontodes disposed obliquely on the patch that includes T. brasiliensis, T. maracnya, T. 'Minority?, T. mirissumba, T. potsdzi, T. vermiculat us, and the seven new species.