Vertebrata Cuvier, 1812 - vertebrates
   Class Agnatha Cope, 1889 [paraphyletic]
     Subclass Cephalaspidomorpha see Class Agnatha Cope, 1889
       Order †Galeaspida Liu, 1965 see Order Galeaspidiformes
         01 Family †Hanyangaspidae Pan & Liu, 1975 see Family Hanyangaspididae Pan & Liu, 1975
         02 Family †Galeaspidae
         03 Family †Eugaleaspidae Liu, 1980 see Family Eugaleaspididae Liu, 1980
         04 Family †Nanpanaspidae Liu, 1975 see Family Nanpanaspididae Liu, 1975
         05 Family †Polybranchiaspidae Liu, 1965 see Family Polybranchiaspididae Liu, 1965
         06 Family †Hunanaspidae see Family Huananaspididae Liu, 1973
         07 Family †Duyunolepidae see Family Polybranchiaspididae Liu, 1965
         08 Family †Lungmenshanaspidae see Family Huananaspididae Liu, 1973
         09 Family †Tridensaspidae
         10 Family †Dayongaspidae Pan, 1985 see Family Dayongaspididae Pan, 1985