| Fusconaia, Tennessee clubshell, Unionidae, Cyclonaias tuberculata, Alasmidonta viridis|Fusconaia subrotunda kirklandiana
Fusconaia subrotunda lesueriana Lea
Fusconaia subrotunda pilaris Lea
Fusconaia subrotunda subrotunda
Long solid mussel Wikipedia
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.