Spectacle case pearly mussel
Encyclopedia
The spectacle case pearly mussel or spectacle case (Cumberlandia monodonta) is a species of bivalve in the Margaritiferidae
Margaritiferidae
Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. They are known as freshwater pearl mussels, because they are capable of producing pearls.-Genera within the family Margaritiferidae:...

 family. It is endemic to the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

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Source

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