| abstract | A new species of oribatid mite in the genus Hydrozetes (Suborder: Oribatida, Family: Hydrozetidae) is described in the current study for the first time from Egypt. The aquatic oribatid mite, Hydrozetes crassipes sp. n., was collected from roots of the aquatic plant, Eichhornia crassipes, floating in the River Nile, Sohag Governorate, Egypt. The descriptive characters of the present species are in accordance with those of the family and genus such as: the dorsum of individuals is smooth or finely punctate, never granulated or rugose, the legs are monodactylous, the prodorsum of the body is characterized with transverse and longitudinal ridges, the exobothridial setae are mostly very short; and trichobothria (bothridium and sensillus) is present. Hydrozetes crassipes sp. n. differs from the other published species in certain characters such as: the humeral regions are supported by two pairs of sclerotized plates, which are tapering inwardly towards the prodorsal lamellae, seven sclerotized opisthosomal plates, the longitudinal distance between setae of (l-) and (d-) series is not equal, the presence of five pairs of genital setae (g1-g5), and three pairs of genital discs. |