Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum †Artiopoda Hou & Bergström, 1997
     †Nektaspidida (Raymond, 1920)
       1 Genus †Buenaspis Budd, 1999
       2.1 Genus †Tariccoia Hammann et al., 1990
       2.2 Genus †Soomaspis Fortey & Theron, 1995
       2.3 Genus †Liwia Dzik & Lendzion, 1988
       3 Genus †Naraoia Walcott, 1912 [paraphyletic]
       3.n Genus †Misszhouia Chen, Edgecombe & Ramsköld, 1997