Phylum [Vertebrata] (Lamarck, 1801) Class Agnatha Cope, 1889 Subclass †Cephalaspidomorphi Moy-Thomas & Mile, 1971 see Class Agnatha Cope, 1889 1 Order †Osteostraci - osteostracans see Order Cephalaspidiformes 2 Order †Anaspida Traquair - anaspids see Class Anaspida Traquair