Vertebrata Cuvier, 1812 - vertebrates
   Class Agnatha Cope, 1889 [paraphyletic]
     Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909
       Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868
         Family †Amphiaspidae see Family Amphiaspididae
           01 Genus †Amphiaspis Obruchev, 1936
           02 Genus †Angaraspis Obruchev, 1964
           03 Genus †Aphataspis Obruchev, 1964
           04 Genus †Argyriaspis Novitskaya, 1971
           05 Genus †Edaphaspis Novitskaya, 1968
           06 Genus †Eglonaspis Obruchev, 1959
           07 Genus †Empedaspis Novitskaya, 1971
           08 Genus †Gabreyaspis Novitskaya, 1968
           09 Genus †Gerronaspis Novitskaya, 1971
           10 Genus †Gunaspis Bystrow, 1959
           11 Genus †Hibernaspis Obruchev, 1939
           12 Genus †Kureykaspis Novitskaya, 1968
           13 Genus †Lecaniaspis Novitskaya, 1971
           14 Genus †Litotaspis Novitskaya, 1971
           15 Genus †Pelurgaspis Obruchev, 1964
           16 Genus †Olbiaspis Obruchev, 1964
           17 Genus †Pelaspis Novitskaya, 1971
           18 Genus †Prosarctaspis Novitskaya, 1968
           19 Genus †Putoranaspis Obruchev, 1964
           20 Genus †Sanidaspis Bystrow, 1959
           21 Genus †Siberiaspis Obruchev, 1964
           22 Genus †Tareyaspis Novitskaya, 1968
           23 Genus †Tuxeraspis Novitskaya, 1971