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.
For more information about the topic Flatworm, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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