Actinonema Cobb, 1920 (emended after Venekey et al. 2019 & Tchesunov 2014)

Cuticle complex, heterogeneous with lateral differentiation as a ridge begins at the end of the pharynx. Six outer labial and four cephalic setae arranged in one circle. Amphideal fovea conspicuous, transversally oval with a double contour. Posterior pharyngeal bulb may develop. Buccal cavity with one prominent dorsal tooth and two small subventral teeth. Spicules simple, thickly cuticularized. Gubernaculum with L-shaped lateral piece. A cuticularized tube may run in between each spicule and gubernaculum.

Type species: A. pachydermatum Cobb, 1920

List of valid species:

A. celtica Boucher, 1976

A. falciforme Shi, Yu & Xu, 2018

A. fidatum Vitiello, 1970

A. grafi Jensen, 1991

A. longicaudatum (Steiner, 1918) Wieser, 1954

A. pachydermatum Cobb, 1920

A. paraceltica Muthumbi & Vincx, 1998a

A. smolae Muthumbi & Vincx, 1998a

Taxon inquirendum: A. chitwoodi Wieser, 1954