Euarthropoda
   †Lamellipedia see Superclass Lamellipedia Hou & Bergström, 1997
     †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997
       Order †Nektaspida Raymond, 1920 - nektaspids see Class Nektaspida Raymond, 1920
         1 Family †Emucarididae Paterson et al., 2010
         2.1 Family †Naraoiidae Walcott, 1912
         2.2 Family †Liwiidae Dzik & Lendzion, 1988 see Subfamily Liwiinae Dzik & Lendzion, 1988