THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION

Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands
An Identification Guide and Educational Resource

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  HomeIdentify taxaSoft bodiedAnnelidaHirudineaGlossiphoniidae
 
 

Glossiphoniidae
(leeches)

  Most Glossiphoniidae feed on macroinvertebrates, but some parasitize fish and other animals. They are poor swimmers and tend to spend their time on the substrate in a variety of water bodies.

Glossiphoniidae are generally flattened with a wide body and narrow head. If a fairly large, distinct sucker is present on the head end, it is fused to the underside of the head and is narrower than the body. They often have from 1 to 4 pairs of eyes.

In a study of Pacific Northwest riverine wetlands, a single leech in the genus Helobdella was encountered.

  Size: large
Identifying feature(s):
flattened with a wide body and narrow head
Habitat:
solid substrates, slack water, some riffles
Tolerance to pollutants:
tolerant
 
 
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