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
                 [Subclass] †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909
                   [Order] †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868
                     1 Genus †Pteraspis Kner, 1847
                     2 Genus †Palaeodus
                     3 Genus †Drepanaspis Schlüter, 1887