| 翻訳と辞書 |
| gondwanatheria ： ウィキペディア英語版 |
gondwanatheria
Gondwanatheria is an extinct group of mammals that lived during the Upper Cretaceous through the Miocene in the Southern Hemisphere, including Antarctica. They are known only from isolated teeth, a few lower jaws, two partial skulls and one complete cranium. Because of this fragmentary knowledge their placement is not clear.
== Classification ==
The affinities of the group are not clear, but gondwanatherians were first interpreted as early xenarthrans, or "toothless" mammals similar to the modern anteater. They were also treated as members of the Multituberculata. The latest thinking is apparently returning towards the xenarthran affinities, or something else entirely. However, a few specimens of gondwanatherians are reclassified as multituberculates. Recent studies have confirmed their position as allotheres related to multituberculates, possibly even true multituberculates, closer to cimolodonts than "plagiaulacidans" are.
There are two known families within Gondwanatheria. The family Sudamericidae was named by Scillato-Yané and Pascual in 1984, and includes the genera ''Sudamerica'', ''Gondwanatherium'' and ''Lavanify''. The family Ferugliotheriidae was named by José Bonaparte in 1986, and includes one genus, ''Ferugliotherium''.
Further fossils have come from India and Antarctica, where gondwanatherians once lived in the lush forests of the Eocene. Some South American genera, previously considered to be metatherians, are reassigned to Gondwanatheria: the Eocene genus ''Groeberia'' and the Miocene (Colhuehuapian) genus ''Patagonia''.
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「gondwanatheria」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.
|
|