[Arthropoda] Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
   Arachnomorpha Heider, 1913
     †Trilobitomorpha Størmer, 1944 see Superclass Trilobitomorpha Størmer, 1944
       †Petalopleura Hou & Bergström, 1997 see Subclass Petalopleura Hou & Bergström, 1997
         1 Genus †Sinoburius Hou et al., 1991
         2 †Xandarellida Chen et al., 1996 see Order Xandarellida Chen et al., 1996