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Megalochelys atlas
''Megalochelys atlas'' is an extinct species of cryptodiran turtle from the Miocene through to the Pleistocene periods. During the dry glacial periods it ranged from western India and Pakistan (possibly even as far west as southern and eastern Europe) to as far east as Sulawesi and Timor in Indonesia.
==Description==
''M. atlas'' is the largest known member of Testudinidae, with a shell length of about , an estimated total length of , and an approximate total height of . Popular weight estimates for this taxon have varied greatly with the the highest estimates reaching up to in some instances.〔Orenstein, R. 2001. Survivors in Armor: Turtles, Tortoises, and Terrapins. Key Porter Books Ltd.〕 However, weights based on volumetric displacement of the skeleton, 〔Brown, B. 1931. The Largest Known Land Tortoise. Nat. Hist. Vol. 31:184–187.〕 or inferences based on two-dimensional skeletal drawings,〔Paul, G.S., and Leahy, G.D. (1994). Terramegathermy in the time of the titans: Restoring the metabolics of colossal dinosaurs. Paleontol. Soc. Spec. Publ. 7, 177-198〕 indicate that ''M. atlas'' was probably closer to – ) in mass. ''M. atlas'' is thus the largest known land turtle. The only larger turtles were the marine ''Archelon'' and ''Protostega'' from the Cretaceous period, and the aquatic, freshwater ''Stupendemys'' of the South American late Miocene.
Like the modern Galápagos tortoise, ''M. atlass weight was supported by four elephantine feet. Since most members of the related genus ''Testudo'' are herbivores, paleontologists believe ''M. atlas'' had the same diet.
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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