Pyganodon cataracta

Pyganodon cataracta, formerly Anodonta cataracta, is a species of large freshwater mussel, an aquatic bivalve mollusc in the family Unionidae, the river mussels. Its common name is the eastern floater.

Subspecies

 * Pyganodon cataracta subsp. cataracta
 * Pyganodon cataracta subsp. marginata

Description
Pyganodon cataracta  can reach a size of 10 - 15 cm.

Distribution and habitat
This mussel is present in freshwater habitats along the Atlantic coast of North America, ranging from Alabama to some parts of Canada. It is typically found in soft-bottomed ponds, rivers and small lakes.

Taxonomy
Like many other of its relatives, the eastern floater was thought to be in the genus Anodonta, but was since moved to other genera such as Pyganodon, Utterbackia, and more.