Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] 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
                     [crown] Clade Amorphea Adl et al. 2012 [Simpson, Medina & Adl 2020]
                       [crown] Clade Obazoa Brown, Sharpe, Silberman, Heiss, Lang, Simpson & Roger 2013
                         [crown] 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 Vertebrata Cuvier, 1812 - vertebrates
                                             [stem] Superclass †Pteraspidomorphi Goodrich, 1909 [monotypic]
                                               Class †Pteraspidomorphi Goodrich, 1909
                                                 Subclass †Heterostraci Lankester, 1868
                                                   Order †Cyathaspidiformes (Kaier, 1930)
                                                     Family †Cyathaspididaeᵀ Flower & Wayland-Smith, 1952
                                                       01 Genus †Alainaspis Elliott & Dineley, 1985
                                                       02 Genus †Allocryptaspis Whitley, 1940
                                                       03 Genus †Americaspis White & Moy-Thomas, 1941
                                                       04 Genus †Anglaspis Jaekel, 1927
                                                       05 Genus †Archegonaspis Jaekel, 1927
                                                       06 Genus †Ariaspis Denison, 1963
                                                       07 Genus †Asketaspis Dineley & Loeffler, 1976
                                                       08 Genus †Boothiaspis Broad, 1973
                                                       09 Genus †Ctenaspis Kiaer, 1930
                                                       10 Genus †Cyathaspisᵀ Lankester, 1865
                                                       11 Genus †Davelaspis Blieck, 1983
                                                       12 Genus †Dikenaspis Denison, 1963
                                                       13 Genus †Dinaspidella Strand, 1934
                                                       14 Genus †Homalaspidella Strand, 1934
                                                       15 Genus †Irregulareaspis Zych, 1931
                                                       16 Genus †Liliaspis
                                                       17 Genus †Listraspis Denison, 1964
                                                       18 Genus †Pionaspis Denison, 1964
                                                       19 Genus †Poraspis Kiaer, 1930
                                                       20 Genus †Ptomaspis Denison, 1963
                                                       21 Genus †Seretaspis Stensiö, 1958
                                                       22 Genus †Steinaspis Obruchev, 1964
                                                       23 Genus †Torpedaspis Broad & Dineley, 1973
                                                       24 Genus †Vernonaspis Flower & Wayland-Smith, 1952