Cephalopods, which include squids and octopuses, vary enormously in size. The smallest are only about 1 centimetre long and weigh less than 1 gram at maturity, while the giant squid can exceed 10 metres 33 in length and the colossal squid weighs close to half a ton , making them the largest living invertebrates. Certain cephalopod species are also noted for having individual body parts of exceptional size.Cephalopods were at one time the largest of all organisms on Earth,and numerous species of comparable size to the largest present day squids are known from the fossil record, including enormous examples of ammonoids, belemnoids, nautiloids, orthoceratoids, teuthids, and vampyromorphids. In terms of mass, the largest of all known cephalopods were likely the giant shelled ammonoids and endocerid nautiloids, though perhaps still second to the largest living cephalopods when considering tissue mass alone.

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