Cheironchus Cobb, 1917

Leduc, Daniel & Zhao, Zeng Qi, 2016, Molecular characterisation of five nematode species (Chromadorida, Selachinematidae) from shelf and upper slope sediments off New Zealand, with description of three new species, Zootaxa 4132 (1), pp. 59-76 : 62

Genus Cheironchus Cobb, 1917

Diagnosis. (from Tchesunov & Okhlopkov (2006)) Six inner labial sensilla in form of conical papillae. Outer labial and cephalic sensilla in a single crown with cephalic setae much longer than outer labial setae. Amphideal fovea multispiral. Short somatic setae or papillae and pores in irregular rows along body. Anterior buccal cavity (cheilostom) unarmed. Posterior buccal cavity (pharyngostom) with three mandibles; two large lateroventral mandibles equal in shape and size and shifted laterally; dorsal mandible vestigial. Pharynx with anterior and posterior bulbs. Male with cup-shaped precloacal supplements. Tail short, ranging from bluntly conical to conical with short cylindrical portion.

Type species. Cheironchus vorax Cobb, 1917

Other valid species

C. conicaudatus Tchesunov & Okhlopkov, 2006

C. dactylocaudatus Tchesunov & Okhlopkov, 2006

C. paravorax Castillo-Fernandez & Decraemer, 1993