[Bilateria] Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
Count: 9p; †2c;9o;27g
   ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval.
  Count: 9p; †2c;9o;27g
     Arthropoda Siebold, 1848 - arthropods
    Count: †1c;9o;19g
       Arachnomorpha Heider, 1913
      Count: †1c;9o;16g
         †Trilobitomorpha Størmer, 1944 see Superclass Trilobitomorpha Størmer, 1944
        Count: †1c;6o;14g
           Subclass †Petalopleura Hou & Bergström, 1997
          Count: †1o;4g
             1 Order †Xandarellida Chen et al., 1996
            Count: †4g