UTAH

UNITAH COUNTY

NW OF DINOSAUR NATIONAL MONUMENT

POPO AGIE FORMATION

OTISCHALKIAN

LATE CARNIAN STAGE

LOWER LATE TRIASSIC EPOCH

LATE TRIASSIC

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: AMPHIBIA LINNAEUS, 1758

SUBCLASS: LABYRINTHODONTIA OWEN, 1860

SUPERORDER: TEMNOSPONDYLIA ZITTEL, 1887

MICROORDER: LIMNARCHIA YATES & WARREN, 2000

ORDER: TREMATOSAURIA PIVETEAU, 1955

Superfamily: METOPOSAUROIDEA Watson, 1919

Family: METOPOSAURIDAE Watson, 1919

Subfamily: METOPOSAURINAE Watson, 1919

Koskinonodon perfectus
= Buettneria perfecta

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