| 翻訳と辞書 |
| Ornithodesmus ： ウィキペディア英語版 |
Ornithodesmus
''Ornithodesmus'' (meaning "bird link") is a genus of small, dromaeosaurid dinosaur from the Isle of Wight in England, dating to about 125 million years ago. The name was originally assigned to a bird-like sacrum (a series of vertebrae fused to the hip bones), initially believed to come from a bird〔 and subsequently identified as a pterosaur. More complete pterosaur remains were later assigned to ''Ornithodesmus'', until recently a detailed analysis determined that the original specimen in fact came from a small theropod, specifically a dromaeosaur. All pterosaurian material previously assigned to this genus has been renamed ''Istiodactylus''.
==Description==
As it is only known from isolated vertebrae, little is known about the appearance of ''Ornithodesmus''. The neural spines of the vertebrae are fused and form a blade over the 9.6 centimetres long sacrum, which is slightly arched. The bases of the neural spines form a lateral platform, and the first two vertebrae of the sequence have deep hollow cavities, which formed space for air sacs.〔
Based on its apparent identity as a dromaeosaur, it was probably carnivorous, and likely measured about long in life. Dromaeosaur teeth probably belonging to a velociraptorine are known from the same formation, but are too large to have belonged to ''Ornithodesmus''; rather, these must have come from a theropod closer in size to the giant ''Utahraptor''.〔
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「Ornithodesmus」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.
|
|