California Department of Fish and Wildlife
Aquatic Biological Assement

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Hirudinea

 

Key Characters 60 species in U.S. 5mm - 45 cm in length. Segmented, dorsoventrally flattened, with oral and caudal sucker.
Tolerance Usually 8-10, as low as 6 in Glossiphoniidae family
Distribution CA, OR, WA, NV, AZ, Baja