Calico Scallop Dissected Like other bivalves, the two valves, or
shells, of the calico scallop are secreted by the thin tissue
called the mantle. These valves are joined at the hinge by a
ligament, and connected by a cylindrical muscle. By contracting
this muscle, the scallop can open and close the two shells.
Calico scallops are hermaphroditic organisms with both male and
female reproductive organs. In the image above the "ripe" gonad
contains the orange eggs and white sperm. Image Credit: FWC