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A cephalopod is any member of the molluscan class Cephalopoda. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot.

Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. About 800 living species of cephalopods have been identified.

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Ammonites Argonauts Belemnites Bobtail squids
Cuttlefishes Michelinoceras Nautiloids Octopuses
Squids Vampire squid