(Greek plural ÃŽÅ¡ÃŽÂµÃâ€ ÃŽÂ±ÃŽÂ»ÃÅ’Ãâ‚¬ÃŽÂ¿ÃŽÂ´ÃŽÂ±
(kephalÃƒÂ³poda); "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.