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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]