SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: DIAPSIDA OSBORN, 1903

INFRACLASS: NEODIAPSIDA BENTON, 1985

LEGION: LEPIDOSAUROMORPHA DUMERIL & BIBRON, 1839

SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)

MAGNORDER: SPHENODONTIFORMES Hay, 1930

ORDER: SPHENODONTIA WILLISTON, 1925

Family: EILENODONTIDAE Ramussen & Callison, 1981

*Toxolophosaurus cloudi