Class Reptilia Linnaeus, 1758 - reptiles
   1 Subclass Anapsida Osborn, 1903 - anapsids
   2 Subclass Lepidosauria Duméril & Bibron, 1839
   3 Subclass Archosauria Cope, 1869 see Division Archosauria Cope, 1869
   4 Subclass †Parapsida (Williston, 1925) [monotypic]
   5 Subclass †Araeoscelida [monotypic] see Order Araeoscelidia Williston, 1913
   6 Order †Trilophosauria Romer, 1956
   7 Order †Weigeltisauria Kuhn, 1939 [monotypic]
   8 Subclass †Euryapsida Colbert, 1945 see Subclass Diapsida Osborn, 1903
   9 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903