Observations on Pseudanisakis rotundata (Rudolphi, 1819) Mozgovoi, 1950, a Common but Little Known Nematode Parasite of Raia radiata Donovan in the Northern North Sea

Abstract

Pseudanisakis rotundata (Rudolphi, 1819) Mozgovoi, 1950, from Raia radiaia in the northern North Sea is redescribed and figured with particular reference to the degree of infection, mode of attachment, the functional morphology of the genitalia and to a possible association between this nematode and a coccidian infection of the same host species. Ressons are given for rejecting Eustoma Piette 1855, as a generic name for a nematode as it is already in use for a Jurassic prosobranch mollusc.