Voight, Janet R. Department of Zoology, Field Museum, Chicago, Illinois.
- Taxonomy and phylogeny
- Reproduction and development
- Links to Primary Literature
- Additional Readings
The cephalopod subclass in the phylum Mollusca that includes living octopods, squids, cuttlefish, and sepiolids (bobtail squids), and the extinct belemnites. Members of the subclass Coleoidea (coleoids) are defined by the possession of five arm pairs (which are reduced to four in octopods; see illustration); arm suckers or hooks with which prey are subdued; chromatophore organs in the skin; a muscular mantle that typically provides jet propulsion; and an internal shell that, although lost in most extant cephalopods, provided buoyancy to the common ancestor. See also: Cephalopoda; Mollusca
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