living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
           Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
             Order Polycladida Lang, 1884
               Suborder Acotylea Lang, 1884
                 Section Craspedommata
                   Family Polyposthiidae Bergendal, 1893
                     1 Genus Polyphalloplana Beauchamp, 1951
                     2 Genus Polyposthides Palombi, 1924
                     3 Genus Polyposthia Graff, 1896
                     4 Genus Cryptocelides Bergendal, 1890
                     5 Genus Metaposthia Palombi, 1924