ENGLAND

AVON AND GLOUCESTERSHIRE COUNTIES

AUST AND GARDEN CLIFFS

HAMPSTEAD FARM QUARRY

WESTBURY FORMATION

PENARTH GROUP

RHAETIAN STAGE

UPPERMOST LATE TRIASSIC EPOCH

LATE TRIASSIC

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: DIAPSIDA OSBORN, 1904

SUPERLEGION: NEODIAPSIDA BENTON, 1985

LEGION: ARCHOSAUROMORPHA HUENE, 1946

SUPERCOHORT CHORISTODERA NOVA

ORDER: CHORISTODERA COPE, 1876

Family: PACHYSTROPHEIDAE Kuhn, 1961

Pachystropheus rhaeticus
= Rysosteus oweni