[Tetrapoda] Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
Count: -
   Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
  Count: -
     Reptilia Linnaeus 1758 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Class Reptilia Linnaeus, 1758
    Count: -
       Eureptilia Olson, 1947
      Count: -
         Romeriida Gauthier, Kluge & Rowe, 1988
        Count: -
           1 Genus †[Paleothyris] Carroll, 1969
          Count: †1s
           2 Diapsida Osborn 1903 [Laurin 1991] see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
          Count: -