Life Cycle of Metagonimoides oregonensis Price, 1931 (Trematoda: Heterophyidae) in North Carolina

Abstract
The examination of approximately 600 infected Gioniobasis proxima over a five year period failed to reveal any metacercariae within mature rediae. The development of M. oregonensis appears to represent a condition whereby only free-swimming cercariae are produced. With this demonstration the life cycle of M. oregonensis is now known to differ in three ways according to the snail host involved. It is possible that there are three strains of M. oregonensis, each with a different variation of life cycle.

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