The stoneflies (Plecoptera) of the Pacific Northwest

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Stoneflies constitute one of the smaller insect orders, the nymphs of which are strictly aquatic. Since the nymphs require cool water and an abundance of dissolved oxygen, adults are usually found near streams. In some northern and alpine regions nymphs develop in lakes where the shore area is composed of gravel. Wind action keeps the water well saturated with oxygen. The world fauna of the order includes about 1,200 species, nearly 400 of which occur in North America. One hundred forty-six species are known to occur within the area covered by this treatment—Washington, Oregon, Idaho, and British Columbia—which has been prepared as a guide to a general knowledge of the order and is designed for use by the amateur as well as by those with more advanced entomological training. It is assumed that anyone attempting to identify stoneflies to genera and species possesses some knowledge of insect anatomy and entomological terminology.

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ELECTRONIC FILE - Zoology: Invertebrates