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How did tapeworms get that way?



How did tapeworms get that way?



Bulletin of the Canadian Society of Zoologists 13(1): 5-8



Freeman suggests that protocestodes evolved directly from free-living ancestors living in aquatic organic sediments in the Pre-Cambrian era. They were very small, biradially symmetrical with a sucker-like mouth opening into a phagocytoblast but no gut, with a metabolically active tegument, and hermaphroditic as individuals or as a colony produced by serial budding.

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