<!-- *** Custom HTML *** --> Three new species of the genus LordellonemaAndrássy, 1960 are described and illustrated. Lordellonema indicumsp. nov. has 0.9–1.1 mm long body; lip region offset by constriction with distinctly protruding labial papillae; odontostyle 13–15 µm long, with aperture occupying about 40–50% of its length; vulva pore-like; tail short, rounded and males absent. Lordellonema paramacrodorumsp. nov. has 1.0–1.2 mm long body; lip region distinctly offset, lips separate, rounded; odontostyle sinuate, 27–29 µm long, with aperture occupying about one-third of its length; vulva transverse; well-developed glandular cells present close to vagina; tail conical with rounded tip. Lordellonema spicularissp. nov. is characterized by its 1.2–1.4 mm long body; lip region angular, offset by constriction; odontostyle 15–16 µm long, aperture occupying 36–44% of its length; vulva transverse; tail convex conoid with blunt terminus; males with non-dorylaimid spicules, 5–7 irregularly spaced ventromedian supplements and lateral guiding pieces absent. Lordellonema porosum is redescribed here after more than five decades from Cabo Verde. L. rapsoides (Heyns et Lagerway, 1965) comb. nov. is redescribed here from Saudi Arabia. A diagnostic compendium of valid species is provided and comment has been made on their biogeography.

Summary: A nematode population (SF7) belonging to the genus Laimydorus siddiqi , 1969, was isolated from the soils of sugarcane fields in the Haridwar district of Uttarakhand, India. Based on morphological, morphometrical, and molecular studies, the nematode was identified as Laimydorus siddiqii . This work represents the first molecular report of this species. Laimydorus siddiqui has a 2.6 to 3.08 mm long body, with a truncate lip region, linear odontostyle, double guiding ring, female genital system amphidelphic, longitudinal vulva, and females with a very long, filiform tail. Males have 56 – 63 μm long spicules and 28 – 29 ventromedial supplements. Molecular analyses utilizing segments of the 28S rDNA placed Laimydorus siddiqi in a clade with Laimydorus zehsaziani from Iran and other representatives of the genera Labronema , Dorylaimus , Prodorylaimus , Calcaridorylaimus , Mesodorylaimus , and Aporcelamellus . However, there is no available 18S rRNA sequence of any known species of Laimydorus , and our sequence is the first SSU rRNA of this genus. These molecular findings support the taxonomic positioning of Laimydorus siddiqui within the broader phylogenetic framework of the family Dorylaimidae, highlighting its relationships with closely related genera.

Five new and thirteen known species of Dorylaimidae are described and illustrated. Prodorylaimium humaimae sp. nov has a 0.97–1.29 mm (female) and a 1.03–1.33 mm (male) long body; a truncate lip region; a transverse vulva; 30–35 μm long spicules, and 6–8 ventromedian supplements. Calcaridorylaimus indicus sp. nov has a 1.47–1.72 mm (female) and a 1.41–1.56 mm (male) long body; a slightly offset lip region; a longitudinal vulva; spicules 36–39 μm and 12–15 ventromedian supplements. Thornenema pseudodidelphis sp. nov has a 1.2–1.6 mm long body; a lip region with distinct labial and postlabial sclerotization; a pseudo-didelphic female genital system; a transverse vulva and a 8.5–14.1 × as long as anal body diameter long tail. Prothornenema cuticulare sp. nov has a 0.93 mm (female) and a 0.93–0.98 mm (male) long body; a cap-like lip region; a vulva transverse with a deep cuticle invagination anterior and posterior to it; spicules 31–32 μm and 17 ventromedian supplements. Prothornenema longicaudatum sp. nov has a 1.05–1.22 mm (female) and a 0.88–0.98 mm (male) long body; a lip region cap-like; a transverse vulva; spicules 30–32 μm long and 13–14 ventromedian supplements. The known species are Mesodorylaimus potus, M. guarani, M. chamoliensis, M. keralaensis, M. longicaudatus, Amphidorylaimus flagellicauday, Laimydorus siddiqii, Calodorylaimus andrassyi, Thornenema mauritianum, T. paraconurum, Opisthodorylaimus cavalcantii, Coomansinema oryzae, and Kunjudorylaimus kunjui.

New species of CrateronemaSiddiqi, 1969 and ChrysonemaThorne, 1929 are described and illustrated from the tropical rain forest soils in India. Crateronema tropicumsp. nov. is characterized by its long body (0.65–0.85 mm); cuticle with distinct transverse striations; lateral chords about one-third of the corresponding body diameter; lip region offset by constriction; pharyngeal expansion 42–53% of total neck length; vulva post-equatorial pore-like; tail elongate conoid, ventrally curved. Chrysonema minorsp. nov. is characterized by long body (0.67–0.85 mm); cuticle with fine transverse striations; lateral chords about one-third to two-fifths of the corresponding body diameter; lips amalgamated, lip region slightly offset by constriction; odontostyle about 0.6–1.0 times lip region diameter long; pharyngeal expansion 41–53% of total neck length; vulva equatorial pore-like; tail elongate conoid, ventrally curved. Males with 14–15 µm long dorylaimoid arcuate spicules, lateral guiding pieces and three ventromedian supplements. Crateronema aestivumSiddiqi, 1969 is redescribed and the photomicrographs are provided for this species for the first time. Diagnostic compendium and keys to valid species of Crateronema and Chrysonema is provided.