Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
         Myopterygii Janvier, 1978 - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade †Placodermiomorphi [monotypic]
               Class †Placodermi McCoy, 1848
                 Order †Acanthothoraciformes see Order Acanthothoraci Stensiö, 1944
                   1 Genus †Brindabellaspis Young, 1980
                   2 Genus †Murrindalaspis Long, 1984
                   3 Genus †Palaeacanthaspis Brotzen, 1934
                   4 Genus †Radotina Gross, 1950
                   5 Genus †Romundina Orvig, 1975