Metazoa see Kingdom Animalia Linnaeus, 1758
   Gastraeozoa
     Trochaeozoa see [unranked] Bilateria Hatschek, 1888
       Gastroneuralia Ulrich, 1951
         Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
           Articulata Cuvier see [unranked] Protostomia Grobben, 1908
             1 Phylum Annelida Lamarck, 1809 - segmented worms
             2 Phylum Echiura Sedgwick, 1898 - spoon worms, echiurans see Class Echiura
             3 Phylum Gnathostomulida Ax, 1956 - gnathostomulids
             4 Phylum Onychophora Grube, 1853 - velvet worms
             5 Phylum Arthropoda Siebold, 1848 - arthropods
             6 Phylum Mollusca Linnaeus, 1758 - molluscs
             7 Phylum Sipuncula Rafinesque, 1814 - peanut worms see Class Sipuncula