Anadara notabilis Röding, 1798
The young Eared Ark has a little “ear,” or wing, projecting from the edge of the squarish posterior area of the shell. As the shell grows to its maximum length of 3½ inches by adding more layers of itself-producing lime (calcium carbonate), the ear is no longer evident. The shell surface is strongly ribbed, the numerous hinge teeth small. The white exterior may be covered with a brown periostracum.
Found from Florida to Brazil, in Bermuda and occasionally on Carolina beaches, a young Eared Ark is an especially charming addition to a shell collection.