During study on soil mesofauna in Choqa Sabz Forest and Dalab Protected Area in Ilam Province (western Iran), the following pseudoscorpions belonging to four families were collected and identifi ed: Chthonius (Chthonius) shelkovnikovi Redikorzev, 1930, Chthonius (Ephippiochthonius) negarinae Nassirkhani and Vafai, 2015, Paramenthus nanus Mahnert, 2007, Cardiolpium asiaticum (Dashdamirov, 1990), and Acanthocreagris iranica Beier, in Mahnert 1976. All of these species are new to the fauna of western Iran. In this survey, the adults of A. iranica collected from Ilam and Lorestan Provinces are redescribed and fi gured. Additionally, its tritonymph and deutonymph are briefl y described.
