Class Reptilia Linnaeus, 1758 - reptiles
Count: [*†*] 4o;47f; †14o;194f [5 Jan 2017]
   1 Subclass Anapsida Osborn, 1903 - anapsids
  Count: [*†*] 1o;11f; †1o;16f [4 Jan 2017]
   2 Subclass Lepidosauria Duméril & Bibron, 1839
  Count: [*†*] 2o;35f; †1o;16f [4 Jan 2017]
   3 Subclass Archosauria Cope, 1869 see Division Archosauria Cope, 1869
  Count: [*†*] 1o;1f; †4o;104f [4 Jan 2017]
   4 Subclass †Parapsida (Williston, 1925) [monotypic]
  Count: [†*] †1o;5f [4 Jan 2017]
   5 Subclass †Araeoscelida [monotypic] see Order Araeoscelidia Williston, 1913
  Count: [†*] †1f [4 Jan 2017]
   6 Order †Trilophosauria Romer, 1956
  Count: -
   7 Order †Weigeltisauria Kuhn, 1939 [monotypic]
  Count: [†*] †1f [4 Jan 2017]
   8 Subclass †Euryapsida Colbert, 1945 see Subclass Diapsida Osborn, 1903
  Count: [†*] †2o;12f [5 Jan 2017]
   9 Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
  Count: [†*] †3o;39f [5 Jan 2017]