protostomes see [unranked] Protostomia Grobben, 1908
   Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
     Lophotrochozoa Halanych, Bacheller, Aguinaldo, Liva, Hillis & Lake 1995 - lophotrochozoans
       Lophophorata Hyman, 1959
         1.1 [Phylum] Phoronida Hatschek, 1888 - phoronids
         1.2 [Phylum] Bryozoa Ehrenberg, 1831 - bryozoans
         2 [Phylum] Brachiopoda Duméril, 1806 - brachiopods