Saturday, June 27, 2009

Common Stonefly (Paragnetina sp.)

These insects go back a long ways; stoneflies and their relatives are known from fossils over 250 million years old. Stoneflies experience incomplete metamorphosis and go through only three stages in their life cycle ... egg, nymph or naiad, and adult. The aquatic naiads are sensitive to toxins and pollutants, making them indicators of water quality.

An image of the exuviae