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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 Entelognathus ： ウィキペディア英語版 Entelognathus ''Entelognathus primordialis'' (“primordial complete jaw”) is a placoderm from the late Ludlow epoch of Qujing, Yunnan, 419 million years ago. A team led by Min Zhu of the Academy of Sciences' Institute of Vertebrate Paleontology and Paleoanthropology in Beijing discovered the intact, articulated fossil in rock formations at Xiaoxiang reservoir. ==Specimen and taxonomy== The holotype of ''E. primordialis'' is the uncrushed, and mostly intact anterior half of an individual with the articulating head and trunk armor preserved in three dimensions. The holotype is about long, and the live animal is estimated to have been over long. In overall form, animal resembles primitive arthrodires, but the anatomy of the jaws strongly suggests the anatomies of bony fish and tetrapods. Specifically, this is the first stem gnathostome with dermal marginal jaw bones. These bones are the premaxilla, maxilla, and dentary.〔 Most known placoderms had simple beak-like jaws made of bone plates.〔 The researchers' cladistic diagram suggests that ''E. primordialis'' forms a polytomy with arthrodires, ptyctodonts, and all advanced gnathostomes (namely bony fish, tetrapods, acanthodians, and chondrichthyes).〔 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「Entelognathus」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.