|Donacidae, the donax clams, have triangular to wedge-shaped shells. The anterior end is narrower than the posterior end. The outer shell is smooth, sometimes with slight radiating ridges. There is a rounded ridge on the posterior end that extends from the beaks to the lower margin. Coloration of the shells vary widely within species. Some even have alternating rays of color and lighter areas. Donaxes live in the upper surface of the intertidal zone of sandy beaches. Receding waves usually expose the clams, which then vigorously bury themselves back into the sand. They are popular in chowders and even eaten raw. There are 2 species found in Texas waters.