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Platyhelminthes as a phylum is divided into 4 classes. The tapeworm class (Cestoda) is endoparasitic. This means they live parasitically inside a host. There is also the ectoparasitic class Monogenea which lives parasitically on the outside of a host.

There are marine specimens and those that live in other moist environments. This is the class Turbellaria.

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15y ago

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