The shell is small, thick, and equilateral as well as compressed laterally. The umbones are small and situated behind the midline. The outer surface is rather smooth. The periostracum is thin and glossy. The ligament is short; the lunule is small. Pallial sinus is deep and broad. The internal margins are crenulated. The color of the shell can vary, but is often white or cream; the interior is whitish.