Image:Hyalella azteca.jpg
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This 1/4-inch-long crustacean, Hyalella azteca, is common in aquatic systems and is used by scientists as an indicator of environmental health and water quality in streams, lakes, and other bodies of water. USDA photo by Scott Bauer. Image Number K8451-1.
[1] (http://www.ars.usda.gov/is/graphics/photos/feb00/k8451-1.htm)
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