Class [Reptilia] Linnaeus, 1758 - reptiles Subclass Lepidosauria Duméril & Bibron, 1839 Order Rhynchocephalia Günther, 1867 - tuataras Suborder Sphenodontoidea Lydekker, 1888 Family †Palacrodontidae Haughton, 1924 [monotypic] see Family Sphenodontidae Cope, 1871 Genus †Palacrodon Broom, 1906