Review of the O. korbi species-group is given. 5 species and 1 subspecies, including four new taxa are known from Southern Anatolia: O. korbi (Reitter, 1902), O. perarmatus Nabozhenko et Tichy, 2006, O. svetlanae sp. nov. svetlanae subsp. nov., O. svetlanae beydagensis subsp. nov., O. nasreddini sp. nov., O. malgorzatae sp. nov. Morphological characters of species-group, bionomics and distribution are discussed.