| 翻訳と辞書 |
| Macrodontopteryx oweni ： ウィキペディア英語版 |
Macrodontopteryx
''Macrodontopteryx'' is a genus of the prehistoric pseudotooth birds of somewhat doubtful validity. These animals were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.〔Bourdon (2005), Mayr (2009: p.59)〕
==Description==
Only a single species, ''Macrodontopteryx oweni'', is known to date. Its remains were found in the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England), where they were deposited about 50 Ma (million years ago) in the Mammal Paleogene zone MP8-9. The fossils were at first assigned to ''Argillornis longipennis'', which is nowadays recognized as junior synonym of ''Dasornis emuinus'', a larger pseudotooth bird than ''M. oweni''. Due to the scarcity of their fossil remains, is not clear whether the pseudotooth bird species described as ''Pseudodontornis longidentata'' is not the same as ''M. oweni'', though its size suggests that it is more likely to be synonymous with ''D. emuinus''. In any case, ''Macrodontopteryx'' itself may well be no distinct genus but rather a large member of the contemporary and sympatric ''Odontopteryx'', or a young or small ''Dasornis''.〔Mlíkovský (2002: p.82), Bourdon (2005), Mayr (2008, 2009: p.56)〕
The only known specimen (BMNH A1) is an incomplete and rather crushed skull with much all of the beak missing. In the living animal it would have measured roughly 30–35 cm (one foot). The wingspan was probably around .〔Mlíkovský (2002: p.82), Mayr (2008, 2009: pp.56-57)〕
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「Macrodontopteryx」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.
|
|