Octopuses, squids and cuttlefish belong to the clade Coleoidea. Tidepools contain starfish, sea anemones, crabs, snails, octopuses and sea urchins. Goliath groupers eat crustaceans, other fish, octopuses, young sea turtles, sharks, and barracudas. Invertebrate predators include crabs, starfish and octopuses. "Cameroceras" is a cephalopod, a taxon of molluscs that includes the octopuses, squids and cuttlefish. Cuttlefish, squid, spirula, vampire squid, and cirrate octopuses have small internal shells. In Japanese waters, they are known to eat fish, shrimp, squid, cuttlefish and octopuses. They are full of fish, lobsters, prawns, crabs, octopuses, mollusks, and sea cucumbers. Cephalopods are members of the class Cephalopoda, which include all squid, octopuses, cuttlefish, and nautiluses. They habitually eat fish, octopuses, and crustaceans. They are eaten by fishes, crustaceans, seastars, octopuses and humans. There is also an analogous brain structure in cephalopods with well-developed brains, such as octopuses. Its prey ranges in size from tiny limpets and crabs to giant octopuses. The bathyal zone contains sharks, squid, octopuses, and many different species of fish. The same is true of the chitinous gladius of squid and octopuses.