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]
       Clade Acrosphenodontia Chambi-Trowell, Martinelli, Whiteside, Romo de Vivar, Soares, Schultz, Gill, Benton & Rayfield 2021
         Clade Eusphenodontia Herrera-Flores, Stubbs, Elsler & Benton 2018
           Clade Neosphenodontia Herrera-Flores, Stubbs, Elsler & Benton 2018
             Clade †Leptorhynchia DeMar, Jones & Carrano 2022
               1.1 Genus †Homoeosaurus Meyer, 1845
               1.2 Genus †Kallimodon Cocude-Michel, 1963
               2 †Kallimodon cerinensis Cocude-Michel, 1963
               3.1.1 Genus †Sigmala Fraser, 1986
               3.1.2 Genus †Vadasaurus Bever & Norell, 2017
               3.2 Clade †Pleurosauridae Lydekker 1888 [] see Family Pleurosauridae Lydekker, 1888
               4 Clade †Saphaeosauridae Nopcsa 1923 [Simões, Caldwell & Pierce 2020] see Family Saphaeosauridae Nopcsa, 1923