There are about 4,500 species and they range from 1 mm to more than 500 mm long. The name "Turbellaria" refers to the "whirlpools" of microscopic particles created close to the skins of aquatic species by the movement of their cilia.
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These are flat worms that vary in length from a few millimeters to many centimeters. Only a few species are known to cause actual infection to humans out of the approximately 70 species.
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Tapeworm are flat, segmented worms that live in the intestines of some animals. Animals can become infected with these parasites when drinking contaminated water or eating the wrong food.
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