Choanolaimus de Man, 1880

Leduc, Daniel & Zhao, Zeng Qi, 2025, Three new nematode species (Chromadorida: Selachinematidae) from the continental slope of New Zealand, European Journal of Taxonomy 989, pp. 119-143 : 123

Genus Choanolaimus de Man, 1880

Type species

Choanolaimus psammophilus de Man, 1880 (= Halichoanolaimus obtusicaudatus Shulz, 1934 ).

Diagnosis (emended from Tchesunov 2014)

All the anterior sensilla are papilliform. Cuticle is laterally differentiated with larger, more widely separated punctations. Spiral amphidial fovea with two or more turns. Rhabdions of the anterior cup-shaped buccal chamber posteriorly bicuspid. Pharynx cylindrical or with weak posterior bulb. Intestine blind; anus absent. Precloacal supplements are papilla pierced by fine pores. Tail very short, rounded conical or semicircular.

Remarks

The type species of the genus occurs in dunes (“about roots of beach spermatophytes”; de Man 1880: 50) and estuarine environments ( Riemann 1966). Halichoanolaimus obtusicaudatus Schulz, 1934 was synonymised with Choanolaimus psammophilus by Gerlach (1964). The diagnosis is emended to reflect the blind intestine and the absence of the anus in representatives of this genus.