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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dinocephalosaurus ： ウィキペディア英語版 Dinocephalosaurus ''Dinocephalosaurus'' is a genus of long necked, aquatic protorosaur that inhabited the Triassic seas. The age of the fossil horizon that the fossils of ''Dinocephalosaurus'' were found in was initially estimated at 228 million years; subsequent study by Wang ''et al.'' (2014) indicated that its age was actually 244 ± 1.3 million years. Its name means "terrible headed lizard", because the first specimen found was just a skull, discovered near Xinmin in Guizhou Province, China in 2002. The second specimen found was near the same location and contained the head and much of the postcrainal skeleton, minus the tail. ''Dinocephalosaurus'' is the "First record of protorosaurid reptile (Order Protorosauria) from the Middle Triassic of China".〔Acta Geologica Sinica, v. 77, n. 4, p. 419-423.〕〔Li,C., Rieppel, O.,LaBarbera, M.C. (2004) "A Triassic Aquatic Protorosaur with an Extremely Long Neck ", ''Science'' 24 September 2004, 305 (5692) p. 1931 〕 ==Description== ''Dinocephalosaurus'' is mostly closely compared with ''Tanystropheus'', both being protorosaurs with necks twice as long as their bodies. While ''Tanystropheus'''s neck was composed of twelve elongated cervical vertebrae, ''Dinocephalosaurus'''s is from the addition of cervical vertebrae with a minimum of 25, giving the neck a length of ~1.7 m compared to a body length of about 1 m. The necks of both taxa are thought to have evolved convergently. The use of the long neck in ''Tanystropheus'' is not fully understood, but it was used for prey capture in ''Dinocephalosaurus''. ''Dinocephalosaurus'' differed from all other protorosaurs in the fact that it was the only one that was fully aquatic, but is thought to have laid its eggs on land. Where most protorosaurs had ossified limbs adapted for terrestrial life, dinocephalosaurus "retained juvenile characteristics in the adult stage, as in many other aquatic tetrapods".〔A Triassic Aquatic Protorosaur with an Extremely Long Neck ", ''Science'' 24 September 2004, 305 (5692) p. 1931 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dinocephalosaurus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.