Phylum Euarthropoda Lankester, 1904 see [unranked] Euarthropoda
   Subphylum †Artiopoda Hou & Bergström, 1997
     Superclass †Trilobitomorpha Størmer, 1944
       Class †Nektaspida Raymond, 1920
         1.1 Genus †Buenaspis Budd, 1999
         1.2 Family †Emucarididae Paterson et al., 2010
         2.1.1 Genus †Phytophilaspis Ivantsov, 1999
         2.1.2 Subclass †Petalopleura Hou & Bergström, 1997
         2.2.1.1 Genus †Saperion Hou et al., 1991
         2.2.1.2 Genus †Tegopelte Simonetta & Delle Cave, 1975
         2.2.2 Family †Naraoiidae Walcott, 1912