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Mesodermochelys
''Mesodermochelys'' is an extinct genus of sea turtle known from the Santonian to the Campanian (Late Cretaceous) of what today is Japan.〔Hirayama R. (2007). "Cranial morphology of ''Mesodermochelys'' (Chelonioidea; Testudines) from the Late Cretaceous of Japan". ''Journal of Vertebrate Paleontology'' 27 (3): 89A. (online, retrieved 28 July 2008 )〕 One species is known, the type species ''M. undulatus'';〔 it was given its binomial name by Ren Hirayama and Tsutomu Chitoku in 1996.〔Hirayama R, Fujii A, Takahashi K. (2006). "A dermochelyid sea turtle from the Upper Cretaceous (Late Campanian) Izumi Group of Shionoe, Takamatsu, Kagawa Prefecture, Western Japan". ''Fossils (Palaeontological Society of Japan)'' 80: 17-20. (online, retrieved 28 July 2008 )〕 Studies of its skull indicate that it was a primitive member of the Dermochelyidae (leatherback turtle family) that was closely related to the Protostegidae.〔 It has been described as the best representative of Mesozoic dermochelyids.〔
==Description==
Like other dermochelyids, ''Mesodermochelys'' had elongated front flippers.〔 One fossil found in Japan's Kagawa Prefecture had a carapace estimated to be 1.3 metres in length.〔 Only the neural or spinal scutes, or individual plates, of the carapace are well grooved.〔
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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