Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
   Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
     1 Synapsida Osborn 1903 [Gauthier et al. 1989]
     2 Eureptilia Olson, 1947