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Parasitology

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Proterometra Macrostoma Research

The furcocystocercous cercariae of the digenetic trematode, Proterometra macrostoma, possess a tail chamber into which its distome body withdraws prior to emergence from its snail intermediate host. The process of distome retraction and the conditions that trigger it in this species are not clear. The objectives of the present study were (1) to describe the retraction process in P. macrostoma; (2) to assess whether osmolality affects cercarial retraction; (3) to evaluate the effect of selected ions on retraction; and (4) to compare the swimming effectiveness of naturally (5 in vivo) retracted versus in vitro retracted cercariae. Retraction of the cercaria body into its tail chamber required only 2 min or less once initiated. Continue reading