Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class Agnatha Cope, 1889 [paraphyletic] Subclass Cephalaspidomorpha see Class Agnatha Cope, 1889 Order †Galeaspida Liu, 1965 see Order Galeaspidiformes Family †Tridensaspidae Liu, 1986 see Family Eugaleaspididae Liu, 1980, nom. praeval.