Coexistence of Indarctos and Amphimachairodus (Carnivora) in the Late Early Hemphillian of Florida, North America

doi:10.1007/s10914-021-09546-9

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	Coexistence of Indarctos and Amphimachairodus (Carnivora) in the Late Early Hemphillian of Florida, North America
	Jiangzuo, Qigao 2,3,4,5; Hulbert, Richard C., Jr.1
刊名	JOURNAL OF MAMMALIAN EVOLUTION
	2021-05-25
页码	22
关键词	Indarctos Amphimachairodus Hemphillian Biochronology Florida
ISSN号	1064-7554
DOI	10.1007/s10914-021-09546-9
通讯作者	Jiangzuo, Qigao(jiangzuo@ivpp.ac.cn)
英文摘要	Fossils of the ursid Indarctos from Withlacoochee River 4A of Florida (late early Hemphillian North American Land Mammal Age, Hh2, similar to 7.5-6.5 Ma) represent the best sample of this genus in North America, including both craniodental and postcranial specimens, yet only the skull has been described. In this study, we describe the other material of this bear from the same locality and review the records of Indarctos in North America. Indarctos from Withlacoochee River 4A has dental characters in accordance with those of typical Indarctos oregonensis, but has distinctly more slender postcranial bones. Indarctos from other localities of North America contains two morphs with regards to postcranial robustness, but lacks a clear geographic pattern. Indarctos from Withlacoochee River 4A shares traits with the Old World Indarctos zdanskyi and may be its descendant in the New World. The machairodont from Withlacoochee River 4A shows typical characters (e.g., presence of distinct P4 preparastyle and mandibular flange) that allow referral to Amphimachairodus rather than to Nimravides. Its morphology also shows a stronger affinity of this population to the Old World Amphimachairodus horribilis rather than to Hh3 Amphimachairodus coloradensis. Previously, most North American records of Amphimachairodus were late Hemphillian (Hh3-4, similar to 6.5-4.5 Ma), when it co-occurred with a different ursid, "Agriotherium." The Withlacoochee River 4A specimens provide evidence that Amphimachairodus dispersed from Asia during the Hh2. The special morphology of Indarctos and the presence of Amphimachairodus in a Hh2 fauna suggest that the environment had begun to change before the significant fauna turnover between the early and late Hemphillian.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20070203] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB31030106] ; Key Frontier Science Research Program of the Chinese Academy of Sciences[QYZDY-SSW-DQC-22] ; Key Frontier Science Research Program of the Chinese Academy of Sciences[GJHZ1885] ; National Natural Science Foundation of China[41430102] ; National Natural Science Foundation of China[41872001] ; National Natural Science Foundation of China[41872005] ; National Natural Science Foundation of China[41772018] ; Second Tibetan Plateau Scientific Expedition and Research Grant[2019QZKK0705] ; Paleontological Society ; UF ; China Scholarship Council ; Frick Fund, Division of Vertebrate Paleontology, AMNH
WOS关键词	LATE MIOCENE ; EVOLUTION
WOS研究方向	Evolutionary Biology ; Zoology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000654135900001
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences ; Key Frontier Science Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Grant ; Paleontological Society ; UF ; China Scholarship Council ; Frick Fund, Division of Vertebrate Paleontology, AMNH
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/18286]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Jiangzuo, Qigao
作者单位	1.Univ Florida, Div Vertebrate Paleontol, Florida Museum Nat Hist, Gainesville, FL 32611 USA 2.Amer Museum Nat Hist, Div Paleontol, New York, NY 10024 USA 3.CAS Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins Chinese, Beijing, Peoples R China 5.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Jiangzuo, Qigao,Hulbert, Richard C., Jr.. Coexistence of Indarctos and Amphimachairodus (Carnivora) in the Late Early Hemphillian of Florida, North America[J]. JOURNAL OF MAMMALIAN EVOLUTION,2021:22.
APA	Jiangzuo, Qigao,&Hulbert, Richard C., Jr..(2021).Coexistence of Indarctos and Amphimachairodus (Carnivora) in the Late Early Hemphillian of Florida, North America.JOURNAL OF MAMMALIAN EVOLUTION,22.
MLA	Jiangzuo, Qigao,et al."Coexistence of Indarctos and Amphimachairodus (Carnivora) in the Late Early Hemphillian of Florida, North America".JOURNAL OF MAMMALIAN EVOLUTION (2021):22.