#subclass_Dibranchiata__Dibranchiata__Dibranchia__subclass_Dibranchia  comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member of:  class_Cephalopoda
  member:  order_Octopoda__Octopoda  octopuses and paper nautilus
     member:  octopod  eight-armed cephalopod lacking an internal shell
     member:  family_Octopodidae__Octopodidae  a family of Octopoda
        member:  genus_Octopus  type genus of the family Octopodidae
           member:  devilfish__octopus__octopu  bottom-living cephalopod having a soft oval body with eight long tentacles
     member:  family_Argonautidae__Argonautidae  represented solely by the genus Argonauta
        member:  genus_Argonauta__Argonauta  type genus of the family Argonautidae: paper nautilus
           member:  paper_nautilus__nautilus__Argonauta_argo  cephalopod mollusk of warm seas whose females have delicate papery spiral shells
  member:  order_Decapoda__Decapoda  squids and cuttlefishes
     member:  decapod  cephalopods having eight short tentacles plus two long ones
     member:  genus_Loligo  squids
        member:  loligo  somewhat flattened cylindrical squid
     member:  genus_Ommastrephes  a genus of Decapoda
        member:  ommastrephes  extremely active cylindrical squid with short strong arms and large rhombic terminal fins
     member:  genus_Architeuthis  giant squid
        member:  architeuthis__giant_squid__giantsquid  largest mollusk known about but never seen (to 60 feet long)
     member:  family_Sepiidae__Sepiidae  true cuttlefishes
        member:  genus_Sepia__Sepia  type genus of the Sepiidae
           member:  cuttlefish__cuttle  ten-armed oval-bodied cephalopod with narrow fins as long as the body and a large calcareous internal shell
     member:  family_Spirulidae__Spirulidae  coextensive with the genus Spirula; included in the order Belemnoidea in some older classifications
        member:  genus_Spirula  genus of small cephalopods with many-chambered spiral shells resembling those of the extinct belemnites
           member:  spirula__Spirula_peronii  a small tropical cephalopod of the genus Spirula having prominent eyes and short arms and a many-chambered shell coiled in a flat spiral
  member:  order_Belemnoidea__Belemnoidea  order of extinct dibranchiate cephalopods related to the surviving spirulas
     member:  family_Belemnitidae__Belemnitidae  family of extinct Mesozoic cephalopods
        member:  belemnite  a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae

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