Lampsilis siliquoidea

Lampsilis siliquoidea, also known as the fatmucket, is a species of freshwater bivalve in the family Unionidae.

Description
Lampsilis siliquoidea is recognized by its brown shell with dark rays, and is usually about 70 mm to 100 mm in size. The shape of the shell is oblong to elliptical, compressed or inflated, with uniform thickness. Fatmucket clams are filter feeders. They feed on algae, phytoplankton, protozoans and organic particles. In the parasitic glochidial stage they feed on blood from hosts species, which include bass, perch, walleye, and sturgeon.

Distribution and habitat
It is widespread in North America, found in the drainages of both the Mississippi River from New York to Minnesota, the Great Lakes, and Hudson Bay. It lives in lakes, rivers, streams and quiet waters, usually on sandy-mud bottoms.