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 Gnathostomataᵀ Gegenbaur, 1874 - jawed vertebrates
                                                   [stem] Class †Placodermi McCoy, 1848 [paraphyletic]
                                                     Clade †Arthrodira Woodward, 1891
                                                       Order †Phlyctaeniiformes
                                                         Suborder †Brachythoraci Gross, 1932
                                                           Clade †Eubrachythoraci Miles, 1971, sedis mutabilis
                                                             Clade †Pachyosteomorphi Stensiö, 1944 [paraphyletic] - pachyosteomorphs
                                                               Clade †Aspinothoracidi Stensiö, 1959
                                                                 Family †Selenosteidae Dean, 1901
                                                                   1 Genus †Gymnotrachelus Dunkle & Bungart, 1939, sedis mutabilis [monotypic]
                                                                   2 Genus †Pachyosteus Jaekel, 1903, sedis mutabilis
                                                                   3 Genus †Stenosteus Dean, 1901, sedis mutabilis
                                                                   4.1.1 Genus †Selenosteusᵀ Dean, 1901
                                                                   4.1.2.1 Genus †Walterosteus Stensiö, 1959
                                                                   4.1.2.2.1 Genus †Enseosteus Jaekel, 1919
                                                                   4.1.2.2.2 Genus †Draconichthys Rücklin, 2011
                                                                   4.2.1 Genus †Rhinosteus Jaekel, 1911
                                                                   4.2.2.1 Genus †Melanosteus Lelièvre & Goujet, 1987
                                                                   4.2.2.2.1 Genus †Driscollaspis Rücklin, Long & Trinajstic, 2015 [monotypic]
                                                                   4.2.2.2.2 Genus †Brachyosteus Jaekel, 1927