Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Platy-helminthes see Phylum Platyhelminthes Gegenbaur, 1859
           Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
             Superorder Archoophora see Class Turbellaria Ehrenberg, 1831
               2 Order Acoela Uljanin, 1870 - acoels see Class Acoela Uljanin, 1870
               3 Order Macrostomida
               4 Order Catenulida Meixner, 1924 - catenulid flatworms
               5 Order Polycladida Lang, 1884