Major Subclasses

Class Cephalopoda

• Subclass Ammonoidea (extinct subclass)
• Subclass Nautiloidea
• Subclass Coleoidea
  • Order Belemnoidea (extinct subclass)
  • Order Octopoda
    • Suborder Cirrata
    • Suborder Incirrata
      • Family Argonautidae (paper nautilus)
      • Family Octopodidae (octopi)
      • Family Tremoctopodidae
  • Order Sepiida (Cuttlefish)
  • Order Sepiolida (little cuttlefish like cephs)
  • Order Teuthida (Squid)
  • Order Vampyromorphida

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• Characters and anatomy
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