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 0.3 - 0.4 mm in length, 4 pairs of legs, Cephalothorax and abdomen fused (unlike true spiders). Very colorful (blues, greens, and reds).More than 600 species in U.S.
Tolerance 5-8
Distribution CA, OR, WA, NV, AZ, Baja