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Hirudinea (subclass)
Nota de aplicación
Members of a subclass containing around 650 species of segmented worms 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, having a flattened body, and being aquatic or living on moist soil. A few species have been used by humans in clinical bloodletting for thousands of years.
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