Oostenbrinkellus, Islam & Ahmad, 2024

Islam, Md Niraul & Ahmad, Wasim, 2024, Oostenbrinkellus gen. n. and a new species of the rare nematode genus Lawtonema Siddiqi, 1998 (Nematoda: Dorylaimida: Tylencholaimoidea) from the Western Ghats, Zootaxa 5428 (1), pp. 75-90 : 76-77

Oostenbrinkellus gen. n.

Diagnosis ( Tylencholaimellidae : Tylencholaimellinae): Slender, medium size nematodes, 0.90–1.3 mm long. Outer cuticle thin, with fine transverse striations; inner layer thicker than the outer layer, finely striated. Lip region cap-like, almost continuous or offset by slight depression; lips more or less amalgamated, perioral region elevated, transformed into a labial disc. Cheilostome a truncate cone. Amphidial fovea large, cup-shaped, aperture slit-like. Odontostyle slender, slightly sinuate, mid region bent slight dorsally, anterior beak-like, with ventral accessory structure (stiffening piece) covering posterior half of the ventral arm; its aperture about one-fifth of the odontostyle length. Odontophore simple rod-like, usually shorter than odontostyle length with distinct basal knobs. Guiding ring strongly sclerotized, refractive. Pharynx consists of a slender and weakly muscular anterior part, expanding gradually into a short cylindrical basal bulb, occupying about one-fifth to one-fourth of the total pharynx length. Female genital system mono-opisthodelphic, anterior genital branch reduced to a simple sac. Vulva a minute pore. Males with dorylaimoid spicules; lateral guiding pieces and rarely a single ventromedian supplement. Tail long, filiform; similar in sexes.

Type and only species

Oostenbrinkellus ventrostylus ( Dhanam and Jairajpuri, 1999) comb. n.

= Oostenbrinkella ventrostylus Dhanam and Jairajpuri, 1999