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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 Arctotherium ： ウィキペディア英語版 Arctotherium ''Arctotherium'' is an extinct genus of South American short-faced bears within Ursidae of the Pleistocene. Their ancestors migrated from North America to South America during the Great American Interchange, following the formation of the Isthmus of Panama during the late Pliocene. The oldest remains are from the Ensenadan epoch within the early-middle Pleistocene 1.2 Mya. Their closest relatives were the North American short-faced bears of genus ''Arctodus'' (''A. pristinus'' and ''A. simus''). The closest living relative would be the spectacled bear (''Tremarctos ornatus''). ''Arctotherium'' was named by Hermann Burmeister in 1879. It was assigned to the Tremarctinae by Krause et al. 2008.〔 A specimen of ''A. angustidens'' from Buenos Aires shows an individual estimated, using the humerus, to weigh between , though the authors consider the upper limit as improbable and say that is more likely. It is still possibly the largest bear ever found and contender for the largest carnivorous land mammal known to science.〔Dell'Amore, C. (2011): (Biggest Bear Ever Found ), National Geographic News, Published February 3, 2011〕 In contrast to their North American relatives, South American short-faced bears showed a trend of declining size and carnivory over time. This has been attributed to increased competition from other, later-arriving or evolving carnivorans, such as jaguars, lions or ''Smilodon'', following the early dispersal of short-faced bears to South America.〔〔 (The North American carnivorans that invaded South America, including short-faced bears and ''Smilodon'', quickly dominated the predatory niches formerly occupied by South America's native metatherian sparassodont and avian phorusrhacid carnivores.) ==Diet== Arctotherium could have hunted large prey such as ground sloths, glyptodonts, meridiungulates, horses, tapirs, camels, and young and/or weak gomphotheres using its massive size and strength as well as eating plants. 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「Arctotherium」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.