REDESCRIPTION OF THE ADULT STAGE OF HYPODERAEUM CONOIDEUM (BLOCH, 1782) (TREMATODA: ECHINOSTOMATIDAE) AND NEW RECORD IN SPAIN

Malacological prospections carried out in the Albufera Natural Park of Valencia (Spain) allowed the collection of Lymnaea peregra (MUlier, 1774) (Gastropoda: Lymnaeidae) naturally infected with larval echinostomes and shedding echinostome cercariae. Metacercariae were ob- tained experimentally from the renopericardial sac of laboratory raised snails: L. peregra, L. truncatula (MUlier, 1774), L. palustris (MUlier,1774) (Gastropoda: Lymnaeidae), Physa acuta (Draparnaud, 1805) (Gastropoda: Physidae) and Gyraulus chinensis (Dunker, 1848) (Gastropoda: Planor- bidae). Adult worms were obtained experimentally from chicks and ducks, but not from rats, mice and golden hamsters, and classified as Hypode- raeum conoideum (Bloch, 1782). The adult morphology of this species is redescribed and compared, as well as differentiated from other Hypodera- eum species reported to date. This is the second record of this adult echinostomatid in Spain, and the first record of the cercaria in this country.