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 Neorhabdocoela see Order Rhabdocoela Ehrenberg, 1831
               Suborder Kalyptorhynchia Graff, 1905 see Order Kalyptorhynchia Graff, 1905
                 Section Eukalyptorhynchia Meixner, 1928
                   01 Family Polycystidae see Family Polycystididae Graff, 1905
                   02 Family Koinocystidae see Family Koinocystididae Meixner, 1924
                   03 Family Psammorhynchidae Karling, 1956
                   04 Family Cytocystidae
                   05 Family Cicerinidae Meixner, 1928
                   06 Family Aculeorhynchidae Schilke, 1969
                   07 Family Cystiplanidae Karling, 1964
                   08 Family Crassicolidae
                   09 Family Bertiliellidae Rieger & Sterrer, 1975
                   10 Family Placorhynchidae Meixner, 1938
                   11 Family Gnathorhynchidae Meixner, 1929