California Department of Fish and Wildlife
Aquatic Biological Assement

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Ephemeroptera Odonata Plecoptera Hemiptera Megaloptera Neuroptera Trichoptera Lepidoptera Coleoptera Diptera Non-Insects

Nemouridae Level 1 Level 2



Key Characters

Glossae and paraglossae subequal. Short and robust body form. Gills absent or restricted to cervical region. Hind wing pads strongly divergent. Hind legs usually can be extended beyond the tip of the abdomen. 2nd tarsal segment shorter than 1st.

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