bilaterians Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
     Gnathifera Ahlrichs, 1995
       1 Gnathostomulida Ax, 1956 - gnathostomulids see Phylum Gnathostomulida Ax, 1956
       2.1 Micrognathozoa Kristensen & Funch, 2000 see Phylum Micrognathozoa Kristensen & Funch, 2000
       2.2 Syndermata Ahlrichs, 1995 see Phylum Syndermata Ahlrichs, 1995