Eudorylaimus kahaqensis sp. n. (Nematoda: Dorylaimida: Qudsianematidae), an interesting new species from Iran.

A new species of the genus Eudorylaimus is described from Kahaq region, Maragheh, East Azarbaijan province in Iran. Eudorylaimus kahaqensis sp. n. is characterized by its 1.40-1.75 mm long body, lip region nearly continuous and 17-21 µm wide and bearing a weakly sclerotized but distinct cephalic framework, cheilostom broad and with convex walls, odontostyle 21-23 µm long with aperture occupying 33-44% of its length, presence of a dorsal coelomocyte a short distance behind the nerve ring, neck 347-397 µm long, DN rather posterior (66-70%), pharyngeal expansion 162-205 µm or occupying 45-53% of total neck length, presence a dorsal cell mass at level of pharyngo-intestinal junction, V = 48-52, caudal region conical elongate (50-73 µm, c = 24-30, c' = 1.9-2.6 in females; 45-68 µm, c = 22-32, c' = 1.7-2.3 in males) and regularly curved ventrad with large hyaline portion, spicules 48-55 µm long and 7-9 irregularly spaced ventromedian supplements lacking hiatus.