[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
           1 Class †Marrellomorpha Beurlen, 1934
          Count: †2o;3g
           2 Order †Emeraldellida Størmer, 1944
          Count: †1g
           3 Order †Retifaciida Hou & Bergström, 1997
          Count: †1g
           4.1 Subclass †Concilioterga nom. null. see Subclass Conciliterga Hou & Bergström, 1997
          Count: †1o;4g
           4.2 Subclass †Nectopleura Hou & Bergström, 1997
          Count: †1g
           4.3 Subclass †Petalopleura Hou & Bergström, 1997
          Count: †1o;4g
           4.4 Subclass †Trilobita Walch, 1771 see Class Trilobita Walch, 1771
          Count: -