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Gigantatypus
''Gigantatypus'' is an extinct late Maastrichtian sea turtle that lived in the southern regions of the Tethys Ocean about off the north eastern margins of Cretaceous Africa immediately before the Cretaceous–Paleogene extinction events . Fossil remains of ''Gigantatypus'' are so far only represented in sediments from Jordan. Estimated at over in length, members of this genus reached remarkably large proportions equivalent to that of ''Archelon'' Wieland, 1896 ,〔 considered as the largest marine turtles to ever roam the oceans of the world. Although ''Gigantatypus ''apparently did not survive the K/T boundary, which also was the fate of other gigantic marine turtles such as protostegids, other genera of Cheloniidae, though significantly smaller in size survived the mass extinction and continued on until the present day.
==References==
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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