Scientific name: family: pectinidaeScallops are a kind of mollusc related to clams and snails. Their shell is in two halves with a hinge joining them. Scallop shells are a very pretty fan-shape. Scallops can swim by opening and closing their shells. The muscle that holds the two halves of the shell together is the part that is commonly seen cooked for food, as you can see in the picture.