[Arthropoda] Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
   Arachnomorpha Heider, 1913
     †Trilobitomorpha Størmer, 1944 see Superclass Trilobitomorpha Størmer, 1944
       †Naraoiidae Walcott, 1912
         †Liwiinae Dzik & Lendzion, 1988
           1 Genus †Liwia Dzik & Lendzion, 1988
           2.1 Genus †Tariccoia Hammann et al., 1990
           2.2 Genus †Soomaspis Fortey & Theron, 1995