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Flatworm

The flatworms are a phylum of relatively simple soft-bodied invertebrate animals.

With about 25,000 known species they are the largest phylum of acoelomates.

Flatworms are found in marine, freshwater, and even damp terrestrial environments.

Most are free-living forms, but many are parasitic on other animals.

There are four classes: Trematoda (Flukes), Cestoda (Tapeworms), Monogenea, and Turbellaria.

Note:   The above text is excerpted from the Wikipedia article "Flatworm", which has been released under the GNU Free Documentation License.
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September 5, 2015

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