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
                   1 Family Discocelidae
                   2 Family Latocestidae Laidlaw, 1903
                   3 Family Stylochidae Stimpson, 1857
                   4 Family Plehniidae Bock, 1913
                   5 Family Polyposthiidae Bergendal, 1893
                   6 Family Emprosthopharyngidae
                   7 Family Taenioplanidae
                   8 Family Cryptocelidae Laidlaw, 1903 see Family Cryptocelididae