[Tetrapoda] Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
   Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
     1 †Mesosauridae Baur, 1889 - mesosaurs
     2.1 Synapsida Osborn 1903 [Gauthier et al. 1989]
     2.2 Reptilia Linnaeus 1758 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Class Reptilia Linnaeus, 1758