Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
       Superorder Lepidosauria Haeckel, 1866 see Superorder Lepidosauriformes Gauthier, Estes & de Queiroz, 1988
         Order Squamata Oppel, 1811
           Suborder Lacertilia Owen, 1842
             1 Family †Kuehneosauridae Romer, 1966
             2 Family †Ardeosauridae Camp, 1923
             3 Family Varanidae Gray, 1827 - monitor lizards
             4 Family †Mosasauridae Gervais, 1853 - mosasaurs