[Arthropoda] Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
   Arachnomorpha Heider, 1913
     †Trilobitomorpha Størmer, 1944 see Superclass Trilobitomorpha Størmer, 1944
       †Helmetiida Novozhilov, 1969 see Order Helmetiida Novozhilov, 1969
         Genus †Saperion Hou et al., 1991