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Re-description of Dorylaimellus graminis and new data (morphological, morphometrical, and molecular) for D. globatus and D. (Axodorylaimellus) parvulus are presented from Taf area, Khorramabad, Lorestan province, Iran. These three species are reported for the first time for Iranian nematode fauna. The population of D. graminis is characterized by its 0.8-1.0 mm long body, lip region offset by constriction, 6-8 pm broad with sclerotized pieces around the vestibule, odontostyle 5-7 pm long, neck region 234-290 pm long, pharyngeal expansion occupying 55-57% of total neck length, female genital system didelphic-amphidelphic, vulva longitudinal (V = 54-57), caudal region convex-conoid (33-36 pm, c = 23.0-30.4, c' = 1.8-2.6), spicules 21-25 pm long, and four spaced ventromedian supplements with a hiatus. The Iranian populations of two other species herein studied don't have significant differences compared to previously described populations. For the first time, the phylogenetic positions of these species based on 28S rDNA (D2-D3 segment) in this study are presented. Also based on molecular analyses we suggest that the genera Dorylaimellus and Axodorylaimellus are synonymous. [ABSTRACT FROM AUTHOR]

Hexamermis zirabi sp. n., recovered from a natural habitat of Mazandaran province, north of Iran, is described based on morphological and molecular data. The new species is characterized by its six cephalic papillae; cuticle with distinct cross fibers; conoid or sharply tapered head; mouth terminal; six hypodermal cords; J-shaped vagina oriented to the anterior end of body; uterus with Z-organs or sclerotized bodies; tail similar in both sexes and bluntly rounded; spicules paired, separate, slightly curved, shorter than body width at cloaca, with rounded tip; and male genital papillae arranged in five rows. In addition to the morphological study, molecular phylogenetic analyses using a partial large subunit (28S D2-D3) were also performed, and the new species formed a highly supported (1.00% Bayesian posterior probability (BPP)) clade with Hexamermis popilliae.