Pseudocheironchus, Leduc, 2013

Leduc, Daniel, 2013, Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand, European Journal of Taxonomy 63, pp. 1-32 : 9

Genus Pseudocheironchus gen. nov.

urn:lsid:zoobank.org:act:D308E75C-FF14-44AB-9DA3-E2297C691AF6

Type species

Pseudocheironchus ingluviosus gen. et sp. nov.

Diagnosis

Cuticle without lateral differentiation or only weak lateral differentiation. Outer labial sensillae and cephalic setae in one circle; cephalic setae slightly longer than outer labial sensillae. Anterior portion of buccal cavity reduced, with six thin, slightly cuticularised rhabdions; posterior buccal cavity with three equal mandibles. Pharynx short, with well-developed anterior and posterior bulbs. Male with cupshaped pre-cloacal supplements. Tail short.

Etymology

This generic name refers to the close similarity between the new genus and Cheironchus . The two genera share a feature not found in any other genus of the Selachinematidae , viz., a pharynx with conspicuous anterior and posterior bulbs.

Remarks

Pseudocheironchus gen. nov. is similar to Cheironchus in having a pharynx with well-developed anterior and posterior bulbs and cup-shaped pre-cloacal supplements. Pseudocheironchus gen. nov. differs from the latter in having a cuticle without or only weak lateral differentiation (vs. lateral differentiation of larger, irregularly spaced punctations in Cheironchus ), cephalic setae only slightly longer than the outer labial sensillae (vs. cephalic setae much longer than outer labia sensillae), and a posterior buccal cavity with three equal mandibles (vs. dorsal mandible reduced). Pseudocheironchus gen. nov. is also similar to Synonchiella in having three equal mandibles in the posterior buccal cavity, but differs from the latter in having a pharynx with anterior and posterior bulbs (vs. no pharyngeal bulb in Synonchiella ).