On two sibling species of Dictyna (Araneae: Dictynidae) from Ukraine and Caucasus

Dictyna ottoi sp. n. is described based on specimens of both sexes collected in Azerbaijan. The new species is closely related to D. armata Thorell, 1875, a species described from Southern Ukraine. Detailed illustrations are provided for both species. Dictyna armata has never been illustrated before. Both species, together with D. uncinata Thorell, 1856, form the uncinata species group. Distribution records of the two sibling species are mapped