Fusconaia subrotunda, the longsolid, long solid mussel or long solid naiad, 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 Fusconaia subrotunda kirklandiana Fusconaia subrotunda lesueriana Lea Fusconaia subrotunda pilaris Lea Fusconaia subrotunda subrotunda
References
External links long solid mussel