octopuses; squids; cuttlefish; pearly nautilus

The cephalopods. The third largest group of molluscs and the group within which the ammonites belong. Living cephalopods include a few species of pearly nautilus, dozens of species of cuttlefish, hundreds of species of squids and the octopus. There are even more species of cephalopods known only from the fossil record, including the ammonites and the belemnites.

The highest class of Mollusca.