Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
  Count: -
     Subclass †Odontornithes (Marsh, 1873)
    Count: [*] †2o2g
       Order †Ichthyornithiformes Marsh, 1873
      Count: -
         Genus †Ichthyornis Marsh, 1872
        Count: -