1 Natura - nature
   2.1 actualia - actual entities
     2 Mundus Plinius - physical world
       3 naturalia - natural bodies
         2 Biota
           3.2 Domain Eukaryota Chatton, 1925 - eukaryotes
             1 Amorphea Adl et al., 2012
               3.2 Opisthokonta Cavalier-Smith, 1987
                 1 Holozoa
                   2.2.2 Kingdom Animalia Linnaeus, 1758 - animals
                     3 Epitheliozoa Ax, 1996
                       2 Eumetazoa Bütschli, 1910 - eumetazoans
                         2 Bilateria Hatschek, 1888 - bilaterians
                           1 Genus †Cyanorus Ivantsov, 2004
                           2 Family †Siphusauctidae O'Brien & Caron, 2012 [monotypic]
                           3 Class †Dipleurozoa Harrington & Moore, 1955
                           4 Phylum †Proarticulata Fedonkin, 1985
                           5 Phylum Acoelomorpha Ehlers, 1985 - acoelomorphs
                           6 ?Phylum Mesozoa van Beneden, 1877
                           7 Eubilateria Ax, 1987