GORGEOUS SEA ANIMALS SURPRISE TOYS 3D PUZZLES - Hammerhead Shark Whale Manta Ray Beluga Turtle.The hammerhead sharks are a group of sharks in the family Sphyrnidae, so named for the unusual and distinctive structure of their heads, which are flattened and laterally extended into a hammer shape called a cephalofoil. Most hammerhead species are placed in the genus Sphyrna while the winghead shark is placed in its own genus, Eusphyra.