Metazoa see Kingdom Animalia Linnaeus, 1758
   Gastraeozoa
     Trochaeozoa see [unranked] Bilateria Hatschek, 1888
       Gastroneuralia Ulrich, 1951
         Aschelminthes Grobben, 1910 see [unranked] Protostomia Grobben, 1908
           Phylum Priapulida Delage & Hérouard, 1897 - priapulids