Abstract This research was carried out in order to determine species belonging to Vermes fauna present in the Bosphorus and some ecological properties of these species. As a result of this study, 31 species belonging to 19 families and 30 genera were determined and three species among them Schizoporella unicornis (Johnston, 1847), Marphysa sanguinea (Montagu, 1815) and Bonellia viridis Rolando, 1821 ] were new records for the Bosphorus fauna, according to present literature. The distribution is given for the obtained 31 species according to stations, zones, depths, bottom structures and salinity.