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flatworms species parasitic living

Flatworm, major group of simple animals that includes the parasitic flukes and tapeworms and the free-living flatworms. Flatworms have long, unsegmented, extremely thin bodies. The largest free-living species grow 1 ft (30 cm) long, though parasitic species may attain 40 ft (12 m). They are found under bark, in fresh water, and in the sea. Freshwater planarian flatworms are often used in biological research.

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