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



Key Characters 150 species in U.S. 5 - 20 mm in length, strongly laterally compressed. Eyes unstalked and compound.
Tolerance variable, from 4-8
Distribution CA, OR, WA, NV, AZ, Baja