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The flatworms, or Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek ÏÎ»Î±ÏÏ, platy, meaning flat and á¼Î»Î¼Î¹Î½Ï (root: á¼Î»Î¼Î¹Î½Î¸-), helminth- , meaning worm) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Explain the basic body plan of members of the phylum Platyhelminthes. Identify representatives of the classes Turbellaria, Trematoda, and Cestoda. Compare and contrast the anatomy and morphology of free-living and parisitic flatworms. Describe the symmetry of this group. Platyhelminthes is a phylum composed of three classes of flatworms. The class Turbellaria (planarians) is free-living, while the remaining classes including the Trematoda (flukes) and Cestoda (tapeworms) are parisitic. Members of the phylum Platyhelminthes are dorsoventrally flattened.