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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 Plesiobalaenoptera ： ウィキペディア英語版 Plesiobalaenoptera ''Plesiobalaenoptera'' is a genus of extinct rorqual which existed in Italy during the late Miocene epoch. The type species is ''P. quarantellii''. It is the oldest known rorqual from the Mediterranean basin. Fossils have been found from sediments of the Stirone River in northern Italy (, paleocoordinates )〔. Retrieved October 2013.〕 that were deposited during the Tortonian age, around .〔 ==Description== ''Plesiobalaenoptera'' was similar in appearance to other rorquals, although it had a relatively wider rostrum than other whales. The genus has several distinguishing features mainly seen in the region of the ear. For example, the periotic bone (which surrounds the inner ear) has a raised central portion and a triangular projection at its front. Like all baleen whales, the tympanic bulla, which surrounds the middle ear, is enlarged and separate from the periotic bone. However, its tympanic bulla has a distinctive high keel. Moreover, the opening of the Eustachian tube into the middle ear is in a high position.〔 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「Plesiobalaenoptera」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.