Nygmatonchus Cobb, 1933

Datta, Tridip Kumar & Al-Helal, Md. Abdullah, 2023, Review of Euchromadorinae (Nematoda: Chromadorida) with description of a new species of Trochamus Boucher & De Bovée, 1971 from the Sundarban, India, Zootaxa 5278 (3), pp. 493-510 : 496-497

Nygmatonchus Cobb, 1933 (emended after Cobb 1933 and Inglis 1969)

Cuticle thick, complex anteriorly, elongate punctations posteriorly; striae on neck of ‘basket-work’ type, on body consisting of dots which fade out towards the middle of the body; lateral differentiation wing-type. Six outer labial and four cephalic setae. Amphideal fovea with large transverse slits with double contour about opposite base of pharynx. No posterior oesophageal bulb. Pharynx cyatholaimoid, dorsal onchium large with small subventral denticles. Male tail arcuate, diminishing rapidly, then conoid; spinneret long, chromadoroid. Precloacal cuticle slightly thickened in male, supplementary organs absent; postcloacal region with a structureless looking cuticular shield, behind which the cuticle is again thickened. Spicules two, equal in size. Gubernaculum appears very faint behind the spicules with L-shaped lateral piece frontal to spicules.

Type species: N. scriptus Cobb, 1933

List of valid species:

N. scriptus Cobb, 1933