Paramphimonhystrella, Huang & Zhang, 2006

Huang, Y. & Zhang, Z. N., 2006, A new genus and three new species of free-living marine nematodes from the Yellow Sea, China, Journal of Natural History 40 (1 - 2), pp. 5-16 : 6

Genus Paramphimonhystrella gen. nov.

Description Body length 740–1916 mm. Cuticle smooth. Head tapering. Buccal cavity deep, conical or

cylindrico-conical, with sclerotized walls. Tooth lacking. Ten cephalic setae; numerous cervical setae. Double-walled ovoid or circular amphids. Spicules slender. Gubernaculum absent. No precloacal supplement. Single anterior ovary. Three caudal glands, and the proximal two large and obvious. Three terminal setae.

Diagnosis and discussion

Paramphimonhystrella gen. nov. is close to Amphimonhystrella Timm, 1961 , but differs from it by its elongated cylindrical or conical stoma; two groups of 8–10 cervical setae each, instead of four cervical setae each group; two of three caudal glands large and obvious. The body size is larger than in species of Amphimonhystrella . This new genus is also similar to Elzalia Gerlach, 1957 , but differs from the latter by the elongated stoma, presence of cervical setae, and the structure of spicules. The principal difference between this new genus and Amphimonhystrella and Elzalia is the structure of the buccal cavity, which is regarded as characteristic of genera in the family Xyalidae . The buccal cavities of species in this new genus are elongated conical and differ distinctly from other genera in this family. Consequently, we propose Paramphimonhystrella as a new genus. The type species of this new genus is Paramphimonhystrella elegans sp. nov.