ulceratus species-group

Diagnosis. Male. T2 with median depression, pair of tufts. Basal portion of the dorsal margin of the paramere much developed. Digitus wide medially. Cuspis elongated. Aedeagal ventral ramus with inner margin sinuous basally, wide, narrowing apically.

Remarks. This species-group contains five species: D. dentiformis Azevedo, D. ulceratus Evans, D. concavatus Azevedo, D. rectilineus Azevedo and Dissomphalus congo sp. nov., the latter three recorded from Espírito Santo.

Distribution. Restricted to the central-eastern region of South America.