Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade dorsates Cavalier-Smith, 2021
                   Clade podiates Cavalier-Smith, 2012
                     Clade Amorphea Adl et al. 2012 [Simpson, Medina & Adl 2020]
                       Clade Obazoa Brown, Sharpe, Silberman, Heiss, Lang, Simpson & Roger 2013
                         Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020] - animal-fungal clade
                           Superkingdom Holozoa Lang, O'Kelly, Nerad, Gray & Burger, 2002
                             Clade filozoa Shalchian-Tabrizi, Minge, Espelund, Orr, Ruden, Jakobsen & Cavalier-Smith, 2008
                               Kingdom Animalia Linnaeus, 1758 - animals
                                 Clade Planulozoa Wallberg, Thollesson, Farris & Jondelius 2004
                                   Subkingdom Bilateria Hatschek, 1888 - bilaterians
                                     Clade Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002
                                       Infrakingdom Deuterostomia Grobben, 1908
                                         Phylum Chordata Bateson, 1885 - chordates
                                           Subphylum Craniata auct.
                                             Infraphylum Vertebrata Lamarck, 1801 - vertebrates
                                               Clade Pan-Gnathostomata Downs 2020
                                                 Superclass †Osteostracomorphi
                                                   Class †Osteostraciᵀ Lankester, 1868
                                                     Order †Cephalaspidiformes Halstead Tarlo, 1967
                                                       [Clade †Cornuata]
                                                         1 Genus †Wladysagitta Voichyshyn, 2006, incertae sedis
                                                         2.1.1.1 [Family †Cephalaspidaeᵀ Agassiz, 1844] see Family Cephalaspididae Agassiz, 1844, nom. praeval.
                                                         2.1.2 [Family †Zenaspidae Nelson, 2006, nom. illeg.] see Family Zenaspididae Stensiö, 1958
                                                         2.2.1 [Family †Thyestiidae nom. imperf.] see Family Thyestidae Rohon, 1892
                                                         2.2.2 [Family †Tremataspidae Woodward, 1891] see Family Tremataspididae Woodward, 1891, nom. praeval.
                                                         2.2.2.0 [Family †Dartmuthiidae Robertson, 1935] see Family Tremataspididae Woodward, 1891, nom. praeval.
                                                         2.2.2.0 [Family †"Sclerodidae" Berg, 1940, orth. inval.] see Family Sclerodontidae Berg, 1940
                                                         2.2.3 [Family †Kiaeraspidae Stensiö, 1932] see Family Kiaeraspididae Stensiö, 1932, nom. praeval.
                                                         2.3 [Family †Benneviaspidae Denison, 1951] see Family Benneviaspididae Denison, 1951, nom. praeval.