頭足類
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]] modified from the primitive molluscan foot.

h4. Extant organisms
* [[squid]]
* [[cuttlefish]]
* [[octopus]]
* [[nautilus (animal)]]

h4. Extinct organisms
* [[ammonite]]
cephalopod