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 Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
               01 Order †Araeoscelida see Order Araeoscelidia Williston, 1913
               02 Family †Mesenosauridae Romer, 1945 see Subfamily Mycterosaurinae Reisz & Berman, 2001, nom. inval.
               03 Family †Coelurosauravidae Carroll, 1978 see Family Weigeltisauridae Kuhn, 1939
               04 Family †Drepanosauridae Berman & Reisz, 1992
               05 Family †Endennasauridae
               06 Order †Choristodera Cope, 1876 [monotypic]
               07 Order †Thalattosauria (Merriam, 1905)
               08 Infraclass Lepidosauromorpha Benton, 1983 see Subclass Lepidosauromorpha Benton, 1983
               09 Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
               10 Order †Placodontia Owen, 1859, incertae sedis