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 Proseriata Meixner, 1938
               1 Family Otoplanidae Hallez, 1892
               2 Family Monocelididae Hofsten, 1907
               3 Family Coelogynoporidae Karling, 1966
               4 Family Nemertoplanidae
               5 Family Polystyliphoridae Ax, 1958
               6 Family Monotoplanidae Ax, 1958
               7 Family Otomesostomidae
               8 Family Bothrioplanidae Vejdovsky, 1895