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

摘要

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 metap-terygoid, wide and square-shaped, junction between metapterygoid and hyomandibula forming high wave-shaped wall, and larger pectoral-fin filament, about 60 % of pectoral-fin length. Trichomycterus brunoi, T. claudiae, T. fuliginosas, 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, andthe 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. maracaya, T. mimonha, T. mirissumba, T. potschi, T. vermiculatus, and the seven new species.