Pareiasauria

Pareiasauria (meaning "cheek lizards") is an extinct clade of large, herbivorous reptiles (traditionally considered "parareptiles") that existed during the Permian period. Pareiasaurs were armoured with osteoderms which covered large areas of the body. They first appeared in southern Pangea during the Middle Permian, before becoming globally distributed during the Late Permian. Pareiasaurs were the largest reptiles of the Permian, some reaching sizes over 1 tonne (2,200 lb), equivalent to the largest contemporary therapsids. Pareiasaurs became extinct in the end-Permian mass extinction event.