Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Class †Placodermi McCoy, 1848
       Order †Acanthothoraci Stensiö, 1944
         1 Family †Palaeacanthaspidae Stensiö, 1944
         2 Family †Weejasperaspididae White, 1978, nom. illeg. see Family Weejasperaspidae White, 1978