living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Cephalopoda Cuvier, 1795 - cephalopods
             Subclass Coleoidea Bather, 1888
               Order Teuthoidea see Order Teuthida Naef, 1916
                 Suborder Oegopsida d'Orbigny, 1845 see Suborder Oegopsina Orbigny, 1845
                   01 Family Lycoteuthidae Pfeffer, 1908
                   02 Family Enoploteuthidae Pfeffer, 1900
                   03 Family Octopoteuthidae Berry, 1912
                   04 Family Onychoteuthidae Gray, 1849
                   05 Family Cycloteuthidae Naef, 1923
                   06 Family Gonatidae Hoyle, 1886
                   07 Family Psychroteuthidae Thiele, 1920
                   08 Family Lepidoteuthidae Pfeffer, 1912
                   09 Family Architeuthidae Pfeffer, 1900
                   10 Family Alluroteuthidae see Family Neoteuthidae Naef, 1921
                   11 Family Histioteuthidae Verrill, 1881
                   12 Family Bathyteuthidae Pfeffer, 1900
                   13 Family Ctenopterygidae Grimpe, 1922 see Family Chtenopterygidae Grimpe, 1922
                   14 Family Brachioteuthidae Pfeffer, 1908
                   15 Family Batoteuthidae Young & Roper, 1968
                   16 Family Ommastrephidae Steenstrup, 1857
                   17 Family Thysanoteuthidae Keferstein, 1866
                   18 Family Chiroteuthidae Gray, 1849
                   19 Family Mastigoteuthidae Verrill, 1881
                   20 Family Promachoteuthidae Naef, 1912
                   21 Family Grimalditeuthidae see Family Chiroteuthidae Gray, 1849
                   22 Family Joubiniteuthidae Naef, 1922
                   23 Family Cranchiidae Prosch, 1847