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nouncomprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)type of:
Definition that contains dibranchia
- nudibranch any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body
- belemnoidea order of extinct dibranchiate cephalopods related to the surviving spirulas
- order belemnoidea order of extinct dibranchiate cephalopods related to the surviving spirulas
- sea slug any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body