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 20 freshwater species in U.S. 1 - 25 mm in length. Body is radially symmetrical, tentacles have nematocysts (stinging cells).
Tolerance 5
Distribution CA, OR, WA, NV, AZ, Baja