Lampsilis higginsi

The Higgins-eye mussel (Lampsilis higginsi ) is an inhabitant of large rivers in the Mid-west. Once more common  the Higgins-eye is now restricted primaily to the main channel of the Mississippi River and is a federally endangered species.  Prefered substrates appear to be gravel, sand, or mud.  The shells are  thick and heavy, and yellowish-brown in color with green or dark rays.  They are rounded-oval in shape, have relatively smooth shell, and can grow to ~ 4 inches in length.  As with other lampsiline mussels females have a distinctly expanded posterior and display a modified mantle margin that resembles a small fish.