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 Protostomia Grobben, 1908
                                         Superphylum Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake, 1997
                                           Panarthropoda Nielsen, 1995 - panarthropods
                                             Tactopoda Budd, 2001
                                               Phylum Arthropoda Siebold, 1848 - arthropods
                                                 Euarthropoda
                                                   Antennulata
                                                     Subphylum †Artiopoda Hou & Bergström, 1997
                                                       Superclass †Trilobitomorpha Størmer, 1944
                                                         Class †Trilobita Walch, 1771 - trilobites
                                                           [Order †Ptychopariida Swinnerton, 1915]
                                                             Genus †Amphorella
                                                             Genus †Angelina Salter, 1859
                                                             Genus †Calculites Fortey, 1983
                                                             Genus †Kingaspidoides Hupé, 1953
                                                             Genus †Miranda Jegorova, 1984, nom. illeg.
                                                             Genus †Regina Egorova, 1967, nom. illeg.
                                                             Genus †Stella Egorova & Savitsky, 1968, nom. illeg.
                                                             0.2.1 [Suborder †Asaphina Salter, 1864] see Superfamily Asaphoidea Burmeister, 1843
                                                             0.2.2 [Suborder †Trinucleina Swinnerton, 1915] see Superfamily Trinucleoidea Hawle & Corda, 1847
                                                             01 Genus †Altitudella Repina, 1974
                                                             02 Genus †Antagmus Resser, 1936
                                                             03 Genus †Atops Emmons, 1844
                                                             04 Genus †Bicella Rasetti, 1955
                                                             05 Genus †Binodaspis Lermontova, 1951
                                                             06 Genus †Chondrastaulina
                                                             07 Genus †Crassifimbra Lochman, 1947
                                                             08 Genus †Eoptychoparia Rasetti, 1955
                                                             09 Genus †Kolbinella Repina, 1960
                                                             10 Genus †Luxella Rasetti, 1955
                                                             11 Genus †Oncchocephalus
                                                             12 Suborder †Ptychopariinaᵀ Richter, 1933
                                                             13 [Suborder †Olenina Hupe, 1952] see Order Olenida Adrain, 2011