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gorgonopsia
Gorgonopsia ("Gorgon face") is an extinct suborder of therapsid synapsids. Like other therapsids, gorgonopsians (or gorgonopsids) were at one time called "mammal-like reptiles" as well as "stem mammals".
==Description==
Their mammalian specializations include differentiated (heterodont) tooth shape, a fully developed temporal fenestra, pillar-like rear legs, a vaulted palate that may have facilitated breathing while holding the prey, and incipiently developed ear bones.〔Laurin, M. (1998). New data on the cranial anatomy of ''Lycaenops'' (Synapsida, Gorgonopsidae), and reflections on the possible presence of streptostyly in gorgonopsians, Journal of Vertebrate Paleontology 18: 765-776.〕 Gorgonopsians are a part of a group of therapsids called theriodonts, which includes mammals.〔Amson, E., Laurin, M. (2011). On the affinities of ''Tetraceratops insignis'', an Early Permian synapsid, (Acta Palaeontologica Polonica 56 ): 301–312.〕 They were among the largest carnivores of the late Permian. The largest known, ''Inostrancevia'', was the size of a large bear with a 45 cm long skull, and 12 cm long saber-like teeth (clearly an adaptation to being a carnivore). They likely did not have a full pelage, but whether they had bristles, scales or naked skin is unknown. They possibly had a combination of all of them, as some mammals still do. Like most therapsids, they are assumed to have been terrestrial, and this is supported both by their morphology and bone microanatomy.
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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