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 2 freshwater species in U.S. Largely marine group, Up to 30 mm. 3 pairs of ocelli, arranged in 2 longitudinal rows at anterior end. Body smooth, unsegmented. Long, protrudable proboscis.
Tolerance 8
Distribution CA, OR, WA, NV, AZ, Baja