[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class †Placodermi McCoy, 1848
           †Antiarchi Cope, 1885 - antiarchs
             Order †Sinolepiformes [monotypic]
               Family †Sinolepidae Liu & Pan, 1958
                 Genus †Grenfellaspis Ritchie, Wang, Young & Zhang, 1992