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A New Species ofAgriotheriumfrom North America, and Implications for Understanding Transformations in the Metaconid-Entoconid Complex of Bears

文献类型：期刊论文

作者Jiangzuo, Qigao1,2,3,4; Flynn, John J.4
刊名JOURNAL OF MAMMALIAN EVOLUTION
出版日期2020-12-01
卷号27期号:4页码:775-787
ISSN号1064-7554
关键词Agriotherium Indarctos Ursidae Miocene Hemphillian NALMA Quiburis Formation Metaconid-entoconid complex
DOI10.1007/s10914-019-09480-x
通讯作者Jiangzuo, Qigao(jiangzuo@ivpp.ac.cn)
英文摘要New material ofAgriotheriumfrom the late Hemphillian (~6 Ma) Quiburis Formation in Arizona, North America is reported. These specimens represent a new species,Agriotherium hendeyi, sp. nov., of small size and with a bucco-lingually narrow lower dentition distinguishing it from North American "Agriotherium"schneiderias well as the genotype and other Old World species ofAgriotherium. Strikingly, the m1 metaconid-entoconid complex of the new species exhibits a morphologically transitional state between the pattern observed inIndarctos(three cusps) and the typicalAgriotheriumpattern (two cusps). Together with a review of the variation inA. africanum, a geometric morphometric analysis permits identification and discussion of a proposed transformation pathway from theIndarctospattern to theAgriotheriumpattern. It is shown that the two cusps in the metaconid-entoconid complex inAgriotheriumcorrespond to the two entoconids inIndarctos, whereas the ancestral metaconid is reduced or lost inAgriotherium. From a developmental perspective, the metaconid fused to the anterior entoconid as a result of the shortening of the talonid, rather than via replacement of the metaconid by a posterior shift of the entoconid, presumably under selective pressure towards a more typically hypercarnivorous tooth morphology and carnivorous diet.
WOS关键词MAMMALIAN DENTITION ; TEETH ; EVOLUTION ; PATTERNS ; LINES ; FAUNA
WOS研究方向Evolutionary Biology ; Zoology
语种英语
出版者SPRINGER
WOS记录号WOS:000579835600012
源URL[http://119.78.100.205/handle/311034/18143]  
专题中国科学院古脊椎动物与古人类研究所
通讯作者Jiangzuo, Qigao
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
3.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
4.Amer Museum Nat Hist, Div Paleontol, New York, NY 10024 USA
推荐引用方式
GB/T 7714		 Jiangzuo, Qigao,Flynn, John J.. A New Species ofAgriotheriumfrom North America, and Implications for Understanding Transformations in the Metaconid-Entoconid Complex of Bears[J]. JOURNAL OF MAMMALIAN EVOLUTION,2020,27(4):775-787.
APA Jiangzuo, Qigao,&Flynn, John J..(2020).A New Species ofAgriotheriumfrom North America, and Implications for Understanding Transformations in the Metaconid-Entoconid Complex of Bears.JOURNAL OF MAMMALIAN EVOLUTION,27(4),775-787.
MLA Jiangzuo, Qigao,et al."A New Species ofAgriotheriumfrom North America, and Implications for Understanding Transformations in the Metaconid-Entoconid Complex of Bears".JOURNAL OF MAMMALIAN EVOLUTION 27.4(2020):775-787.

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来源：古脊椎动物与古人类研究所

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