metazoans Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   [stem] Phylum †Procoelomata Bergström, 1989
     Class †Machaeridia Withers, 1926
       Order †Sachitida He, 1980
         1 Family †Siphogonuchitidae Qian, 1977
         2 Family †Wiwaxiidae
         3 Family †Halkieriidae Poulsen, 1967