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
                                                 [Order †Pteraspidomorphes] see Subclass Heterostraci Lankester, 1868
                                                   Genus †Anatolepsis
                                                   Genus †Archodus
                                                   Genus †Aspidosteus Obruchev, 1941
                                                   [Genus †"Boothaspis" Halstead, 1985, nom. null.] see Genus Boothiaspis Broad, 1973
                                                   Genus †Canadapteraspis Dineley & Loeffler, 1976
                                                   Genus †Clydonaspis Elliott, 1994
                                                   Genus †Dyreaspis Heintz, 1934
                                                   Genus †Ennosviaspis
                                                   Genus †Glossoidaspis Branson & Mehl, 1931
                                                   Genus †Grumantaspis Obruchev, 1964
                                                   [Genus †"Homaspidella" Harland, 1997, nom. null.] see Genus Homalaspidella Strand, 1934
                                                   [Genus †"Irregulariaspis" Stensiö, 1958, nom. null.] see Genus Irregulareaspis Zych, 1931
                                                   Genus †Kallostracon
                                                   [Genus †"Karelosteus" Obrutschev, 1930, nom. nud.] see Genus Karelosteus Obrutschev, 1933
                                                   Genus †Karelosteus Obrutschev, 1933
                                                   Genus †Kiangsuaspis P'an, 1962
                                                   [Genus †"Obliaspis" Moy-Thomas, 1971, nom. null.] see Genus Olbiaspis Obruchev, 1964
                                                   Genus †Pilolepsis
                                                   Genus †Poriferaspis
                                                   Genus †Psephaspis Ørvig, 1961
                                                   [Genus †Pycnaspis Ørvig, 1958] see Genus Astraspis Walcott, 1892
                                                   Genus †Schizosteus Obruchev, 1940
                                                   Genus †Strophisterus
                                                   Genus †Tartuosteus Obruchev, 1961
                                                   [Genus †"Ulititaspis" nom. null.] see Genus Ulutitaspis Elliott, 1984
                                                   Genus †Yoglinia Obruchev, 1943