• Australian Museum: Leeches - A study of the behavior, biology, adaptation to habitat, feeding habits and importance to medicine, reveals leeches to be fascinating and extraordinary animals.
• Class Hirudinea - Basic introduction to the orders and families, habitat, and value as an indicator of overall ecosystem health.
• Haemopis marmorata - Exercise from Invertebrate Anatomy OnLine covering the systematics, natural history, external and internal anatomy and behavior of this leech and another leech, Hirudo medicinalis.
• Hirudinea - An introduction to the biology, classification and ecology of leeches, the subclass Hirudinae
• Hirudo medicinalis - Article about the medicinal leech from Animal Diversity Web.
• Leeches - Photographs of various species from the North Pacific and the Ukraine.
• Leeches - Hirudinea - Photographs of members of representative taxa, and the equipment used in studying them.

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