Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Reptilia Linnaeus, 1758 - reptiles
  Count: 4o6f1g; †20o115f227g
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
    Count: -
       Order †Choristodera Cope, 1876
      Count: [*] †1f1g
         Family †Champsosauridae Cope, 1884
        Count: [*] †1g
           Genus †Champsosaurus Cope, 1877
          Count: -