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
             Phylum Echiura Sedgwick, 1898 - spoon worms, echiurans see Class Echiura