Some 680 species of leech have been described, of which around 100 are marine, 480 freshwater and the … See more

Leeches show a remarkable similarity to each other in morphology, very different from typical annelids which are cylindrical with a fluid-filled space, the coelom (body cavity). In leeches, most of the coelom is filled with b… See more

Leech bites are generally alarming rather than dangerous, though a small percentage of people have severe allergic or anaphylactic reactions and require urgent medical care. Symptoms of these reactions include red … See more

• Ruppert, Edward E.; Fox, Richard S.; Barnes, Robert D. (2004). Invertebrate Zoology, 7th Edition. Cengage Learning. ISBN 978-81-315-0104-7. See more

• Media related to Hirudinea at Wikimedia Commons
• Data related to Hirudinea at Wikispecies
• The dictionary definition of leech at Wiktionary… See more