A new cystophorous cercaria inLunatia pallida(Broderip & Sowerby) (Naticidae): Possibly the cercaria ofHemiurus levinseniOdhner, 1905 (Digenea, hemiuridae)

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Abstract
Large, previously undescribed cystophorous cercariae, which develop in rediae, were found in one specimen of the prosobranch Lunatia pallida (Broderip & Sowerby) (Naticidae) in the northern øresund, Denmark. The cercaria swims vigorously by a furcate appendage very similar to that of the cercaria of Derogenes varicus (Müller, 1784) (= Cercaria appendiculata Pelseneer, 1906). The free-swimming cercariae were seized by small calanoid cope pods and thereby inoculated into their haemocoel. The infected copepods died before the metacercariae could be identified. The cercaria is believed to be that of Hemiurus levinseni Odhner, 1905, because the arctic-boreal distribution of H. leuinseni coincides with that of L. pallida, and because the remaining hemiuroids found in Danish waters, either have known molluscan hosts, have a mainly Lusitanean distribution, or live in shallow, brackish inlets.