[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata (Lamarck, 1801)
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Pentadactyla lipobranchia
               Branch Monocondyla
                 Class Reptilia Linnaeus, 1758 - reptiles
                   I Subclass Chelonia Brongniart, 1800 see Class Chelonia Brongniart, 1800
                   II Subclass Lepidosauria Duméril & Bibron, 1839
                   III Subclass Pterosauria Kaup, 1834 see Order Pterosauria Kaup, 1834
                   IV Subclass Dicynodonta
                   V Subclass Ornithoscelida (Huxley, 1870)
                   VI Subclass Crocodilia