Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
     Platyzoa Ax, 1987 see [unranked] Spiralia Schleip, 1929
       Phylum Plathelminthes see Phylum Platyhelminthes Gegenbaur, 1859
         1 Catenulida Graff, 1905 - catenulid flatworms see Order Catenulida Meixner, 1924
         2 Rhabditophora Ehlers, 1985 see Subphylum Rhabditophora Ehlers, 1985