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Summary The mother sporocyst, daughter sporocyst, cercaria and metacercaria of Cercaria cerastodermae I nom. nov. are described from the haemocoel of the digestive gland and gonad of Cerastoderma edule (L.) in Britain. The daughter sporocyst is unusual in having elaborate subtegumental projections that join a central broad chamber which extends to surround individual metacercariae.
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Sannia et al. (1978) studied this question.
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