Doyle, Peter Department of Earth Sciences, University College London, London, United Kingdom.
Last reviewed:October 2019
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An order of extinct 10-armed cephalopod mollusks with an internal shell. The order Belemnitida belongs to the subclass Coleoidea in the class Cephalopoda (phylum Mollusca). Constituent members, which are all extinct, are known as belemnites (Fig. 1) and are related to modern squids and cuttlefish. The name belemnite is derived from the Greek word belemnos, meaning “dart.” Many belemnites are important index fossils. See also: Cephalopoda; Coleoidea; Extinction (biology); Index fossil; Mollusca; Paleontology
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