Macroinvertebrates

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Water penny is an aquatic beetle which, when young, resembles a tiny penny because of the oval shape and copper color of its shell. Their presence can be used a an indicator of water quality. Like caddisflies, they are sensitive to pollution. They cannot tolerate an environment in which there is too much buildup of algae or sediment. The water penny is found in all kinds of climates and on all continents except Antarctica.