Pseudocheironchus, Leduc, 2013

Genus Pseudocheironchus gen. nov.

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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 ).