Stoneflies: Order Plecoptera

Nearly all species of stoneflies are found exclusively in running water (streams).

Range in size from a few millimeters to 5 centimeters.

Most are herbivores.

Pteronarcys californica nymph (Plecoptera: Pteronarcyidae) (4.5 centimeters)

Image of Pteronarcys californica nymph

Illustration courtesy of B.C. Kondratieff, Colorado State University.

Source:

Ward, J.V. and B.C. Kondratieff. An Illustrated Guide to the Mountain Stream Insects of Colorado. Niwot, Colorado: University Press of Colorado, 1992.

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