Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Subclass Anapsida Osborn, 1903 - anapsids
               1 Order †Captorhinida
               2 Order †Mesosauria Seeley, 1892 [monotypic]
               3 Genus †Eunotosaurus Seeley, 1892