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pareiasaur
Pareiasaurs (meaning "cheek lizards") are an extinct group of anapsid reptiles classified in the family Pareiasauridae. They were large herbivores that flourished during the Permian period.
==Description==
Pareiasaurs ranged in size from long, and may have weighed up to . They were stocky, with short tails, small heads, robust limbs, and broad feet. The cow-sized species Bunostegos who lived 260 million years ago is the earliest known example of a tetrapod with a fully erect posture as its legs were positioned directly under their bodies.〔(Pre-reptile may be earliest known to walk upright on all fours )〕 Pareiasaurs were protected by bony scutes called osteoderms that set into the skin. Their heavy skulls were ornamented with multiple knobs and ridges. The leaf-shaped multi-cusped teeth resemble those of iguanas, caseids, and other reptilian herbivores. This dentition, together with the deep body, which may have housed an extensive digestive tract, are evidence of a herbivorous diet. Most authors have assumed a terrestrial lifestyle for pareiasaurs, but bone microanatomy suggests a more aquatic, plausibly amphibious lifestyle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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