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A new species belonging to the genus Laimydorus , and a known species of the genus Labronema , collected from the rhizosphere of grassland plants in West Azarbaijan province, Iran, are presented. The new species is characterized by its body length (1.56–1.81 mm in females and 1.39–1.57 mm in males), lip region offset by weak constriction and wider than adjacent body (11–14 μm), odontostyle 17–20 μm long, neck length 312–434 μm, vulva longitudinal (V = 42.2–46.5), uterus well-developed and with Z-differentiations, tail long (219–237 μm, c = 6.9–8.3, c´ = 8.2–10) in females, short and convex-conoid with blunt terminus (19–22 μm, c = 68–72.5, c´ = 0.77–0.84) in males, spicules 40–45 μm long, and 18–20 contiguous ventromedian supplements with hiatus. Molecular analyses, using Bayesian inference based on D2-D3 expansion segments of the 28S rRNA (LSU), placed the new species in a clade comprising representatives of the genera Nevadanema , Dorylaimus , Labronema , Calcaridorylaimus , Mesodorylaimus , and Prodorylaimus , which all belong to Dorylaimidae. In addition, new data (molecular, morphometrics, images, and geographic distribution) are presented for the Iranian population of Labronema vulvapapillatum. [ABSTRACT FROM AUTHOR]

This contribution provides morphological and molecular data for one new and one known species of the genus Pungentus. The first species, P. azarbaijanensis n. sp., was recovered from the rhizospheric soil of grasses, collected in West Azarbaijan province, Iran, and was characterized by 2082–2365 μm long females having an angular lip region separated from the rest of the body by a constriction, 33–35 μm long odontostyle, vulva at 43.5–51.0%, 27.0–29.5 μm long rounded-conoid tail, and males unknown. It was compared morphologically with five species: P. angulosus , P. crassus , P. marietani , P. parapungens and P. pungens , which have didelphic-amphidelphic female reproductive system, body longer than 1.5 mm, and odontostyle longer than 20 μm. The second species, P. engadinensis , was recovered in three different regions of Iran (Mazandaran, Semnan and East Azarbaijan provinces). It was compared morphologically with some other populations reported all over the world. Besides morphological studies, molecular phylogenetic studies using partial sequences of 28S rDNA D2-D3 fragments were performed, and the phylogenetic relations of the two Iranian populations with other species and genera were discussed. [ABSTRACT FROM AUTHOR]