Long solid mussel

The long solid mussel, also known as the long solid naiad, scientific name Fusconaia subrotunda, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.

This mussel, sometimes called a pigtoe, is found in river gravel. Young mussels are light brown, but darken to nearly black with age.

This species is found in Canada and the United States.

Subspecies

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