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The Cephalopods ("head-foot") are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusc foot into the form of arms or tentacles. Teuthology is the study of cephalopods, and teuthologists are those that do it.

The class contains two extant subclasses. In the ColeoideaSepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Subclass Coleoidea is the grouping of cephalopods containing all the primarily soft-bodied creatures. Unlike its sister group the Nautiloidea, which has a rigid outer shell for protection, the, the mollusc shell has been internalized or is absent; this subclass includes the octopus14 in two suborders, see text For other meanings of "octopus", see Octopus (disambiguation). The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. The term may also refer to only those ces, squidThis article is about the sea animal. For other uses of "squid", see Squid (disambiguation). Myopsina Oegopsina The squid is a marine mollusk of the class Cephalopoda, subclass Coleoidea, order Teuthida of which there are two major suborders, Myopsina ands, and cuttlefishSepiadariidae Sepiidae Cuttlefish are animals of the order Sepiida and are marine cephalopods, small relatives of squids and nautilus. Description Cuttlefish have an internal shell, large eyes, and ten arms furnished with denticulated suckers, by means of. In the Nautiloidea the shell remains; this subclass includes the nautilusThis article is about an order of mollusks. See Nautilus (disambiguation) for more terms. Allonautilus perforatus Allonautilus scrobiculatus Nautilus belauensis Nautilus macromphalus Nautilus pompilius pompilius Nautilus pompilius suluensis Nautilus steno. There are around 786 distinct living speciesThis article discusses biological species. Also see combinatorial species for the mathematical meaning of the term. Species is also a movie by Roger Donaldson. In English "species" is both singular and plural. The word " specie" is unrelated and is used t of Cephalopods. Two important extinct subclasses are Ammonoidea, the ammoniteThis article is about the marine animal. For the novel see Ammonite (novel), for the Biblical people, see Ammon (nation), and for the ancient Egyptian god see Ammon. Orders: Goniatida Ceratida Ammonitida Suborders: Ammonitina Anarcestina Ancyloceratina Ces and Belemnoidea, the belemnites.

Cephalopods are found in all the oceans of the world and at all depths. They are regarded as the most intelligent of the invertebrates and have well developed senses and large brains. They have special skin cells called chromatophores that change color and are used for communication and camouflage.