The term 'diamond-shaped ray' is a reference to the SKATE, a type of fish found in the shallow coastal waters of the Atlantic and Pacific Oceans. Skates have diamond-shaped pectoral fins that are used for swimming and maneuvering in the water. They also have a long, slender tail that helps them to move quickly through the water. Skates are bottom-dwellers and feed on small invertebrates such as worms, crustaceans, and mollusks.