[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass †Pteraspidomorphi Goodrich, 1909 [monotypic]
         Class †Pteraspidomorpha
           Subclass †Heterostraci Lankester, 1868
             Order †Cyathaspidiformes Kiaer, 1930
               Suborder †Hibernaspidoidei
                 1 Family †Eglonaspididae Tarlo, 1962 see Family Amphiaspididae Obruchev, 1939
                 2 Family †Hibernaspididae Obruchev, 1939 see Family Amphiaspididae Obruchev, 1939
                 3 Family †Aphataspididae Novitskaya, 1971 see Family Amphiaspididae Obruchev, 1939