یک گونه جدید و سه گونه شناخته شده از راسته Dorylaimida از ایران

During a study in 2015 soil samples were collected from the rhizosphere of different plants in some north and northwestern regions of Iran, four species belonging to the order Dorylaimida namely Proleptonchus brevisaccus, Prodorylaimium sp, Prodorylaimus longicaudatoides and Xiphinema macroacanthum were recovered. The Iranian population of P. brevisaccus obtained in this study is very similar to Proleptonchus paucipapilatus, however, is differentiated by different value of b, esophageal bulb length and odontostyle length. This species has comparatively shorter post vulval sac (15.6-25 µm) whereas, the other species of this genus have long post vulval sacs. The male specimen of this species is reported for the first time with the following morphometric chracteristics: body lengh 1.2 mm, a (35.4), b (5.2), c (70.9), spicules length (35 µm) and 5 ventromedian supplements. Members of Prodorylaimium are medium-sized nematodes (1.1-2.5 mm) with strong and straight odontostylet that is longer than body width. Pre-rectum in females is short while longer in males. Vulva is generally transverse and males have 6-10 ventromedian supplements, tail in both sexes are elongate to filiform (about 5-26 times of anal body diameter). The genus Prodorylaimium is separated from its close genera by having truncated head, distinct ventromedian supplements (3-13), shorter pre-rectum and a dorylaimoid type spicules. The species Prodorylaimium sp is differentiated from other species belonging to this genus by differences in the values of c (14.7-18.2), c´ (8-12), V (49-52) and tail length (100-125 um). P. longicaudatoides is differentiated from other species of this genus by odontostyle longer than 30 µm, body length (2.8-3 mm), number of supplements (22-24), longer spicules (70-80 um) and longer tail in females (500-560 um). This species resembles P. paralongicaudatus in having long odontostyle, but is separated because of the number of supplements (22-24 vs 15-20). Xiphinema macroacanthum was described based on female genital system structure including the presence of Z bodies (Z differentiation) and spines/crystaline structures of different shape and size. This species is very similar to X. ingens, however, it differs from X. ingens by lip width (13.5-16.5 vs 20-21 µm), the length of expanded part of esophagus (120-124 vs 170-190 um), pre-equatorial vulva and the presence of males