Vertebrata Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 [paraphyletic] Subclass Cephalaspidomorpha see Class Agnatha Cope, 1889 Order †Galeaspida Liu, 1965 see Order Galeaspidiformes Family †Eugaleaspidae Liu, 1980 see Family Eugaleaspididae Liu, 1980