First record and detailed description of the male of Ilyocypris inermis Kaufmann, 1900 (Crustacea, Ostracoda)

Bisexual populations of Ilyocypris inermis Kaufmann, 1900 were reported for the first time from 5 diff erent aquatic bodies in Bolu and Erzincan (Turkey). The males were compared with the males of the other 11 species of the genus Ilyocypris (I. australiensis, I. biplicata, I. decipiens, I. dentifera, I. divisa, I. fallax, I. getica, I. gibba, I. lacustris, I. mongolica, and I. monstrifica) and described based on examinations of the soft body parts (e.g., hemipenis, legs, clasping organs) and valves. Ecological characteristics of habitats where the bisexual populations found were discussed for future studies.