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On some selachinematid nematodes (Chromadorida: Selachinematidae) deposited in the collection of the Smithsonian National Museum of Natural History

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For more content, see Nematologica.

A review and descriptions are given of some new or poorly known species of the family Selachinematidae mounted in glycerin on slides deposited in the nematode collection of the Smithsonian National Museum of Natural History, Washington DC, USA, namely: Cheironchus vorax; C. conicaudatus sp. n.; C. dactylocaudatus sp. n.; Gammanema uniformis (Cobb, 1920) comb. n., and Synonchiella hopperi. All species were found along the Atlantic coast of the USA. Species of the genus Cheironchus are characterised by details of the mandibles that may be significant for species discrimination within the genus. Three closely related species (Cheironchus vorax, C. paravorax and C. conicaudatus sp. n.) share a similar form, the mandibles consisting of an arm and two lateral palms with tiny hooks. The mandibles differ from one another in the presence/absence of a denticulate crest and in the number of palm hooks. The fourth species, C. dactylocaudatus sp. n., differs from the other three species by having vestigial mandibles devoid of palm hooks, presence of cheilostomatal sclerotisations and a tail with a posterior cylindrical portion. All three Cheironchus species studied possess extra-pharyngeal, longitudinal musculature around the anterior widening of the pharynx. This musculature evidently acts to protrude the mandibles beyond the oral aperture. An emended diagnosis of the genus Cheironchus is provided. Gammanema uniformis comb. n. is recorded and described for the first time since the original publication under the name Trogolaimus uniformis Cobb, 1920. The genus Trogolaimus is regarded as a junior synonym of Gammanema. Synonchiella hopperi is redescribed with a brief discussion of its unique feature – an unpaired copulatory spicule.


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