Clade Lepidosauria Haeckel 1866 [de Queiroz & Gauthier 2020]
see Subclass Lepidosauria Duméril & Bibron, 1839
Clade Rhynchocephalia Günther 1867 [Gauthier, Estes & de Queiroz 1988]
see Order Rhynchocephalia Günther, 1867
Clade Sphenodontia Williston 1925 [Evans 2003]
1 Genus †Diphydontosaurus Whiteside, 1986
2 Clade Acrosphenodontia Chambi-Trowell, Martinelli, Whiteside, Romo de Vivar, Soares, Schultz, Gill, Benton & Rayfield 2021