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 natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade Discoba Simpson 2009
                       Superphylum Discicristata Cavalier-Smith, 1998 [coordinate rank]
                         Phylum Euglenozoa Cavalier-Smith, 1981
                           Subphylum Postgaardia Cavalier-Smith, 2016 [monotypic]
                             Class Postgaardeaᵀ T. Cavalier-Smith, 1998
                               Order Postgaardidaᵀ T. Cavalier-Smith, 2003
                                 1 Genus Calkinsia Lackey, 1960
                                 2 Genus Postgaardiᵀ T. Fenchel et al., 1995 [monotypic]