Oostenbrinkellus gen. n. and a new species of the rare nematode genus Lawtonema Siddiqi, 1998 (Nematoda: Dorylaimida: Tylencholaimoidea) from the Western Ghats

One new genus and a new species belonging to the superfamily Tylencholaimoidea from the Western Ghats, India are described and illustrated. Oostenbrinkellus gen. n. is characterized by being a medium sized nematode with a 0.92-1.3 mm long body; lip region cap-like with distinct labia disc; amphidial fovea cup-shaped, aperture occupying about two-thirds to four-fifths of the lip region diameter; odontostyle 10.5-12.0 mu m long, slender, slightly sinuate, mid region bent slight dorsally, anterior beak-like, with a distinct ventral stiffening piece covering the posterior half of the ventral arm; its aperture about one-fifth of the odontostyle length, 1.6-2.0 times the lip region diameter long; odontophore 7.5-9.0 mu m long, with distinct basal knobs, total stylet 18.5-20.5 mu m; pharynx consisting of an anterior slender part, expanding posteriorly into a short cylindrical basal bulb, 19-25% of total pharyngeal length; female genital system mono-opisthodelphic with anterior uterine sac; tail long filiform both the sexes; males with 24-29 mu m long spicules. Lawtonema indicum sp. n. is characterized by having a 1.25-1.28 mm long body; lip region cap-like with distinct labial disc; amphidial fovea cup-shaped, aperture occupying about three-fourths of the lip region diameter; odontostyle 10- 10.5 mu m long, its tip bent dorsally; odontophore 9.5-10 mu m long, total stylet length 19.5-20.0 mu m; pharynx expanding gradually into a short cylindrical bulb, 19-20% of total pharyngeal length; female genital system amphidelphic; tail long filiform; male with 24 mu m long spicules.