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Notes on the Natural History of the Leeches (Hirudinea) on the George Reserve, Michigan.
Exercise from Invertebrate Anatomy OnLine covering the systematics, natural history, external and internal anatomy and behavior of this leech and another leech, Hirudo medicinalis.
This page states that leeches are among the most highly specialized of the annelids. They are predominantly freshwater organisms, although there are marine and terrestrial forms. Leeches are highly specialized predators that feed on blood.
The authors studied morphological and ultrastructural features of the salivary glands and proboscises of Placobdella ornata, Placobdella parasitica, and Desserobdella picta by light and electron microscopy.