Platyhelminthic Parasites of Invertebrates

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Abstract
The platyhelminthic parasites of invertebrates are rhabdocoelous turbellarians or have descended from a primitive rhabdocoelidan stock. These worms are predisposed toward symbiotic existence and the great majority of them became parasitic. It is probable that certain of them became parasites of invertebrates in Cambrian time and that their descendants gave rise to present-day members of the Mesozoa, Cestoidea, and malacobo-thriid Trematoda, all of which begin their life cycles when their larvae infect invertebrate hosts.

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