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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 Presbyornis ： ウィキペディア英語版 Presbyornis ''Presbyornis'' is an extinct genus of anseriform bird. It contains two unequivocally accepted species; the well-known ''P. pervetus'' and the much lesser-known ''P. isoni''. ''P. pervetus'' was approximately the size and shape of a goose, but with longer legs; ''P. isoni'', known from a few bones, was much larger, more than swan-sized. Other fossils, more doubtfully assigned to this genus, are also known. ==Fossils== The fossil record of ''P. pervetus'' includes many complete skeletons from Green River Formation sites (Early Eocene), suggesting that the birds nested in colonies and possibly were liable to succumb to botulism, similar to many colony-nesting waterfowl or shorebirds today. ''P. isoni'' is known from the Late Paleocene Aquia Formation (Maryland, 61-62 MYA) humerus (USNM 294116) and a fingerbone (USNM 294117) that were initially described, as well as from the humeri that were initially believed to be from ''Headonornis'' (BMNH PAL 3686, 5105, 6240). As these are Late Eocene or even Early Oligocene (BMNH PAL 5105, Bembridge Marls) in age, they possibly belong to a distinct taxon. ''P. recurvirostris'' is a disputed species possibly synonymous with ''P. pervetus''; it is known from a partial wing (KUVP 10105) found in Colton Formation Eocene sediments of the Wasatch Plateau near Ephraim, Utah. Undescribed fossils are also known from the Paleocene of Utah and possibly the Early Eocene of Mongolia.〔Kurochkin ''et al.'' (2002)〕 The coracoid still assigned to ''Headonornis''〔Dyke (2001)〕 may also belong into this genus. 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「Presbyornis」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.