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

Hydropsychidae Level 1 Level 2



Key Characters

Thoracic segments with dorsal, sclerotized plates, abdomen with branched ventral gills, anal prolegs with tufts of setae at bases.Larvae construct fixed, case-like retreats, spin silk nets for food collection ("net-spinning caddisflies").

Tolerance variable, from 0-6
Distribution CA, OR, WA, NV, AZ