Anodonta cataracta

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

Subspecies
Anodonta cataracta subsp.  cataracta
Anodonta cataracta subsp.  marginata

Description
Anodonta cataracta  can reach a size of . 

Distribution and habitat
This mussel is present in freshwater habitats along the Atlantic coast of North America.  It is found in soft-bottomed ponds, rivers and small lakes. 

References

Richard A. Tankersley - Larval Brooding by the Freshwater Unionid Mussel Anodonta Cataracta  - Wake Forest University.  Department of Biology, 1992
The Freshwater Mussels (Unionoida) of the World
Catalogue of Life

cataracta
Category:Bivalves described in 1817