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Class Hirudinea belongs to phylum Annelida. These are parasitic in nature which is equipped with suckers used for creeping. Leeches are primarily freshwater annelids, but some live in the ocean and some in moist soil or vegetation. The majority of leeches are predators on small invertebrates, most swallow their prey whole, but some suck the soft parts from their victims. Some leeches are parasites rather than predators and suck the body fluids of their victims without killing them.