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
       1 Gnathifera Ahlrichs, 1995
       2.1 Phylum Gastrotricha Metschnikoff, 1864 - gastrotrichs
       2.2 Phylum Plathelminthes see Phylum Platyhelminthes Gegenbaur, 1859