Kingdom [Animalia] Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
       Class Agnatha Cope, 1889
         "Ostracoderms"
           1 Order †Osteostraci Lankester, 1868 - osteostracans see Order Cephalaspidiformes Halstead Tarlo, 1967
           2 Order †Anaspida Traquair - anaspids see Class Anaspida Traquair
           3 Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868
           4 Order †Coelolepida Nielsen & Kristensen, 1996