One member of this order, the giant Amazon leech ( Haementaria ghilianii), can grow to a half metre (about 18 inches) in length. Members of the order Rhynchobdellida occur in the sea as well as in fresh water. Leeches occur primarily in fresh water and on land. The length of the body ranges from minute to about 20 cm (8 inches) or even longer when the animal stretches. Leech, (subclass Hirudinea), any of about 650 species of segmented worms (phylum Annelida) characterized by a small sucker, which contains the mouth, at the anterior end of the body and a large sucker located at the posterior end.
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