From Wikimedia Commons, the free media repository

Mytilus edulis

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  Cooked mussels

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  Mussels in bouchot pilings

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Freshwater mussels

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  Duck mussel

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  Zebra Mussel

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  Depressed River Mussel

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  Swollen river mussel

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Saltwater mussels

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  California mussel (Mytilus californianus)

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  Mussels attached to rock

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  diagram