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Haeckel Gamochonia.jpg
Various octopus and squid.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Coleoidea
Bather, 1888

The Coleoidea are a group of mollusks making up most of the living cephalopods. Octopus, squid, and cuttlefish are all members of the Coleoidea. They do not have shells on the outside, but some do have a bone or shell inside. All Coleoidea live in the ocean.