Class [Reptilia] Linnaeus, 1758 - reptiles Subclass Lepidosauria Duméril & Bibron, 1839 Order Rhynchocephalia Günther, 1867 - tuataras Suborder Sphenodontoidea Lydekker, 1888 Family †Polysphenodontidae Kuhn, 1969 [monotypic] 1 Genus †Polysphenodon Jaekel, 1911