اولین گزارش جنس Oriverutus Siddiqi, 1971 از ایران

To identify plant parasitic and free-living nematodes of the Kharvanagh region, East Azarbaijan province that has high natural vegetation diversity, several soil samples were collected from the rhizosphere of the area during 2016-2017. The nematodes were extracted, fixed and transferred to pure glycerin using common nematology methods. Microscopic slides were prepared from the extracted nematodes. Among different species identified, Oriverutus pagarus Ahmad and Jairajpuri, 1987 was also obtained. Its morphological and morphometric characters were studied under light microscope and compared with literature. Based on the available sources, the genus Oriverutus (Dorylaimida, Nordiidae) is a new report for nematodes fauna of Iran. This genus is characterized by the prominent and high labial region, odontostyle relatively slender and long with short aperture, pharyngo-intestinal junction often having three cardiac cells, amphid aperture is a large transverse slit on labial region, tail elongate-conoid, vulva longitudinal or transverse and spicules dorylaimid. Oriverutus pagarus could be separated by having longitudinal vulva, uterus with longitudinal plications in lumen and sphincter cell surrounding it. The species is distinguished from O. ecea by having long body size (1.2-1.4 vs 0.82 - 0.98 mm), lower c value (21-23 vs 23-38), less c΄value (2.1-2.4 vs 0.8-1.8), and is separated with longer body (1.2-1.4 vs 0.82-1.2 mm), more c value (21-23 vs 14-18) from O. neopagarus. Oriverutus pagarus also differes from O. biformis by less body length (1.2-1.4 vs 1.53-2.21 mm), shorter odontostylet (16-20 vs 38 - 62 µm), lower c value (21-23 vs 35 - 62) and shorter spicules (45 vs 69-85 µm).