Hình: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.


Public domain This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture.

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