Class [Reptilia] Linnaeus, 1758 - reptiles
   Subclass Lepidosauria Duméril & Bibron, 1839
     Order Rhynchocephalia Günther, 1867 - tuataras
       Suborder Sphenodontoidea Lydekker, 1888
         Family Sphenodontidae Cope, 1871 - tuataras
           Subfamily †Homoeosaurinae Gervais, 1859
             1 Genus †Homoeosaurus Meyer, 1845
             2.1 Genus †Kallimodon Cocude-Michel, 1963
             2.2 Genus †Leptosaurus Fitzinger, 1837