♥Κεφαλόποδα | Cephalopods♥
Created as a place for me to share my love of cephalopods.
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A cephalopod (Greek plural Κεφαλόποδα (kephalópoda); "head-feet") is any member of the mollusc class Cephalopoda, characterized by bilateral body symmetry, a prominent head, and a modification of the mollusk foot, a muscular hydrostat, into the form of arms or tentacles. Teuthology, a branch of malacology, is the study of cephalopods. These creatures became dominant around the Ordovician period. The fishing industry name for this class is inkfish, referring to many cephalopods' ability to squirt ink. The class contains two extant subclasses. In the Coleoidea, the mollusk shell has been internalized or is absent; this subclass includes the octopus, squid, and cuttlefish. In the Nautiloidea, the shell remains; this subclass includes the nautilus. About 800 distinct living species of cephalopods have been identified. Two important extinct taxa are Ammonoidea, the ammonites, and Belemnoidea, the belemnites.
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