This class includes the leeches.
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- Class Hirudinea Basic introduction to the orders and families, habitat, and value as an indicator of overall ecosystem health.
- Hirudinea An introduction to the biology, classification and ecology of leeches, the subclass Hirudinae
- Freshwater Leech: Macrobdella decora Photographs and information on this leech.
- Hirudo medicinalis Article about the medicinal leech from Animal Diversity Web.