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{short description of image}**Image Number K8451-1** 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.  Photo by Scott Bauer.  640 pixels wide: (k8451-1.jpg)   Please visit our Image Gallery


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