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 Catenulida Graff, 1905 - catenulid flatworms see Order Catenulida Meixner, 1924