| 翻訳と辞書 |
Hesperocyon
''Hesperocyon'' is an extinct genus of canids (subfamily ''Hesperocyoninae'', family ''Canidae'') that was endemic to North America, ranging from southern Canada to Colorado. It appeared during the Uintan age-Bridgerian age (NALMA) of the Mid-Eocene 42.5 mya—31.0 Ma. (AEO).〔(Paleobiology Database ) Collection 16626, Swift Current Creek, Saskatchewan, Canada. Authorized by Dr. John Alroy, entered by J. Alroy on February 18, 1993〕 ''Hesperocyon'' existed for approximately .
==Taxonomy==
''Hesperocyon'' was assigned to Borophagini by Wang et al. in 1999〔 and was the earliest of the canids to evolve after the Caniformia-Feliformia split some 42 million year ago. Fossil evidence dates ''Hesperocyon gregarius'' to be at least 37 million years old, but the oldest ''Hesperocyon'' has been dated at 39.74 mya from the Duchesnean North American Land Mammal Age.
The Canidae subfamily Hesperocyoninae probably arose out of ''Hesperocyon'' to become the first of the three great dogs groups: Hesperocyoninae (~40-30 Ma), Borophaginae (~36-2 Ma), and the Caninae lineage that led to present-day Canidae, inclusive of modern-day wolves, foxes, coyotes, jackals and dogs (''Canis familiaris''). At least 28 known species of Hesperocyoninae evolved out of ''Hesperocyon'', including those in the following five genera: ''Ectopocynus'' (32-19 mya), ''Osbornodon'' (32-18 mya), ''Paraenhydrocyon'' (20-25 mya), ''Mesocyon'' (31-15 mya) and ''Enhydrocyon'' (31-15 mya).〔Wang, X. (1994). "Phylogenetic systematics of the Hesperocyoninae (Carnivora, Canidae)". ''Bulletin of the American Museum of Natural History'' 221:1-207.〕〔Wang, Xiaoming, Tedford, Richard H. & Taylor B. E. (1999). "Phylogenetic systematics of the Borophaginae (Carnivora: Canidae)". ''Bulletin of the American Museum of Natural History'' 243:1-391.〕
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「Hesperocyon」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.
|
|