Leeches are animals belonging to the phylum of the subclass Annelida Hirudinea. There are types of leeches that can live on land, fresh water, and sea. Like his relatives, Oligochaeta, leeches also have cliticles. Like earthworms, leeches are also hermaphrodite. The European drug leech, Hirudo medicinalis, has long been used for medical expulsion (plebotomy) medically.
