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A mussel is a bivalve mollusc that can be found in lakes, rivers, creeks, intertidal areas, and throughout the ocean.

The saltwater mussels (family Mytilidae) and freshwater mussels (family Unionidae) are not thought to be closely related and are grouped in different subclasses, despite considerable similarities in appearance.

Note:   The above text is excerpted from the Wikipedia article "Mussel", which has been released under the GNU Free Documentation License.
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November 25, 2015

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updated 12:56 pm ET