Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Superclass Agnatha Haeckel, 1895 see Class Agnatha Cope, 1889
               Class †Ostracodermata
                 1 [Subclass] †Cephalaspidomorphi Moy-Thomas & Mile, 1971
                 2 [Subclass] †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909
                 3 [Subclass] †Thelodonti Kiaer, 1932