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Archaeothyris
''Archaeothyris'' is an extinct genus of ophiacodontid synapsid that lived during the Late Carboniferous and is known from Nova Scotia. Dated to 306 million years ago, ''Archaeothyris'', along with a more poorly known synapsid called ''Echinerpeton'', are the oldest undisputed synapsids known.〔Falcon-Lang, H.J., Benton, M.J. & Stimson, M. (2007): Ecology of early reptiles inferred from Lower Pennsylvanian trackways. ''Journal of the Geological Society'', London, 164; no. 6; pp 1113-1118. (article )〕 ''Protoclepsydrops'' also from Nova Scotia is slightly older but is known by very fragmentary materials.〔(【引用サイトリンク】url=http://www.palaeocritti.com/by-group/eupelycosauria/archaeothyris )〕
==Description==
As a living creature ''Archaeothyris'' looked like a modern-day lizard, although at long, it was one of the larger carnivores that were scurrying around the carboniferous forests.〔(【引用サイトリンク】url=http://www.prehistoric-wildlife.com/species/a/archaeothyris.html )〕
It was also more advanced than the early sauropsids, having strong jaws that could open wider than those of the early reptiles. While its sharp teeth were all of the same shape, it did possess a pair of enlarged canines, suggesting that it was a carnivore.
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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