|A new cystophorous cercaria in Lunatia pallida (Broderip & Sowerby) (Naticidae): Possibly the cercaria of Hemiurus levinseni odhner, 1905 (Digenea, Hemiuridae)|
Køie, M. (1990). A new cystophorous cercaria in Lunatia pallida (Broderip & Sowerby) (Naticidae): Possibly the cercaria of Hemiurus levinseni odhner, 1905 (Digenea, Hemiuridae). Ophelia 31(2): 77-84
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326, more
Animal morphology; Invertebrate larvae; Swimming; Taxonomy; Lunatia pallida (Broderip & G. B. Sowerby I, 1829) [WoRMS]; Marine
Large, previously undescribed cystophorous cercariae, which develop in rediae, were found in one specimen of the prosobranch Lunatia pallida (Naticidae) in the northern Oeresund, Denmark. The cercaria swims vigorously by a furcate appendage very similar to that of the cercaria of Derogenes varicus (= Cercaria appendiculata). The free-swimming cercariae were seized by small calanoid copepods 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 , because the arctic-boreal distribution of H. levinseni 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.