California Department of Fish and Wildlife
Aquatic Biological Assement

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Heptageniidae Level 1 Level 2

Heptageniidae

 

Key Characters

Tarsi longer than claws; tibiae and tarsi straight, mandibles not visible in dorsal view. Head and body noticeably flattened.

Tolerance Variable, from 0-4
Distribution CA, OR, WA, NV, AZ, Baja