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                                        Naidid worms were sorted from 27 samples of aquatic macrophyta  including ceratophyllum demersum ,  Potamogeton crispus and, Hydrilla verticellat with associated filamentous algae were collected from Euphrates River at Al-Mussayab city, 60 Km southwest Baghdad. The result of sorted worms  revealed the presence of eight  species of subfamily Naidinae, which  are consider as new records for Iraq, including Stephensoniana trivandrana; Paranais  frici, Ophidonais serpentine, Specaria josinae, Dero (Dero) evelinae , Dero (Aulophorus) indicus , Nais  pseudobtusa  and finally N. stolci. This investigation includes morphological descriptions for each species illustrated by identification criteria photos.