Phylum [Vertebrata] (Lamarck, 1801) Class Agnatha Cope, 1889 1 Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909 2 Subclass †Cephalaspidomorphi Moy-Thomas & Mile, 1971 see Class Agnatha Cope, 1889