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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 Promissum ： ウィキペディア英語版 Promissum ''Promissum'' is an extinct genus of primitive chordate that lived in the Ordovician period, about 500 million years ago. A conodont, ''Promissum'' had a primitive mouth under its eyes with mineralized teeth, which are both typical for conodonts, some call it the Niagara Foundation fish. Also a primitive backbone. It probably looked like a small eel or large worm, lacking any kind of fins except for perhaps a small one on the tail. It was relatively large for a conodont, reaching about in length. Well-preserved specimens were discovered in the Soom shale of South Africa in 1994.〔 〕 ''Promissum'' was probably capable of maintaining a cruising speed, but not of bursts of speed.〔 == References == 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「Promissum」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.