Dasumia gasparoi sp. n. is described based on specimens of both sexes. The new species is compared with the similar D. crassipalpis (Simon, 1882), described from Syria; and with D. mariandyna Brignoli, 1979, the only previously known species of the genus recorded from Turkey. Furthermore, we point out that, due to some contradictions to the original description of the genus, D. mariandyna may necessarily belong to another genus. Detailed morphological descriptions, diagnosis and figures of the copulatory organs of the new species are presented.