California Department of Fish and Wildlife
Aquatic Biological Assement

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Ephemerellidae Level 1 Level 2

Ephemerellidae

Key Characters

Abdominal gills absent on segment 2, rudimentary or absent on segment 1, present on segments 3-7 or 4-7. Gills have dorsal and ventral lamella (with numerous lobes). Paired abdominal tubercles often present.

Tolerance Variable, from 0-7
Distribution CA, OR, WA, NV, AZ, Baja