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 350 species in U.S. 10 - 150 mm in length. Eyes stalked, compound, large, and moveable. Head and thoracic segments fused to form cephalothorax
Tolerance typically 6-8
Distribution CA, OR, WA, NV, AZ, Baja