New species of Trichomycterus (Teleostei : Siluriformes : Trichomycteridae) lacking a pelvic fin and girdle from the Andes of Argentina

Trichomycterus catamarcensis, new species, is described hem a tributary to the high elevation Laguna Blanca in Departamento Belen, Provincia de Catama rca, Argentina, Characters from various body systems indicate that the new species is a member of the subfamily Trichomycterinae. The new species is s eparable from the other members of the Trichomycterinae by its lack of the pelvic fins and girdle, the form of the body and caudal fin, the number of dorsal fin rays and ribs, its pigmentation pattern, the form of premaxillar y dentition, and the maximum body size.