California Department of Fish and Wildlife
Aquatic Biological Assement

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Rhyacophilidae Level 1 Level 2



Key Characters

Meso- and metanotum membranous. Abdominal segment IX with dorsal, sclerotized plate, most of anal proleg free from segment IX. Larvae free-living ("primitive caddisflies"), predominantly predaceous. Prefer cool, flowing waters.

Tolerance 0-2
Distribution CA, OR, WA, NV, AZ