Cercariae of the lakes Maarsseveen (Netherlands) infecting Bithynia spp. (Gastropoda: Prosobranchia) and Physa fontinalis (Gastropoda: Pulmonata)

In 1978 cercariae have been collected from four species of freshwater snails in two lakes near Utrecht (Netherlands). Eleven species are recorded, of which six are described in detail. Five of these are new: Cercaria gutta n. sp. (Psilostomidae), C. cana n. sp. (Notocotilydae), C. quadrata n. sp. (Pleurogenetinae), C. abdita n. sp. and C. dyjannae n. sp. (both probably belonging to the Plagiorchiida, because they show characters of the group of Xiphidocercariae). Of C. dyjannae only the metacercarial cysts have been found. The sixth cercaria described is that of Psitochasmus oxyuris (Creplin, 1825).