Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Class Cephalopoda Cuvier, 1795 - cephalopods
       Subclass Coleoidea Bather, 1888
         Order Teuthoida - squids
           Genus Architeuthis Steenstrup, 1857 - giant squid
           Genus Bathyteuthis Hoyle, 1885
           Genus Chiroteuthis d'Orbigny, 1841
           Genus Doryteuthis Naef, 1912
           Genus Dosidiscus Steenstrup, 1857 see Genus Dosidicus Steenstrup, 1857
           Genus Gonatus Gray, 1849
           Genus Histioteuthis d'Orbigny, 1841
           Genus Illex Steenstrup, 1880
           Genus Loligo Lamarck, 1798 - long-finned squid
           Genus Lycoteuthis Pfeffer, 1900 - firefly squid
           Genus Octopoteuthis Rüppell, 1844
           Genus Ommastrephes d'Orbigny, 1835