Cretaceous fossil reveals a new pattern in mammalian middle ear evolution

doi:10.1038/s41586-019-1792-0

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	Cretaceous fossil reveals a new pattern in mammalian middle ear evolution
	Wang, Haibing 1,3; Meng, Jin 4; Wang, Yuanqing 1,2,3
刊名	NATURE
	2019-12-05
卷号	576 期号:7785 页码:102-+
ISSN号	0028-0836
DOI	10.1038/s41586-019-1792-0
通讯作者	Wang, Yuanqing(wangyuanqing@ivpp.ac.cn)
英文摘要	The evolution of the mammalian middle ear is thought to provide an example of 'recapitulation'-thetheorythat the present embryological development of a species reflects its evolutionary history. Accumulating data from both developmental biology and palaeontology have suggested that the transformation of post-dentary jaw elements into cranial ear bones occurred several times in mammals(1,2). In addition, well-preserved fossils have revealed transitional stages in the evolution of the mammalian middle ear(1,3,4). But questions remain concerning middle-ear evolution, such as how and why the post-dentary unit became completely detached from the dentary bone in different clades of mammaliaforms. Here we report a definitive mammalian middle ear preserved in an eobaatarid multituberculate mammal, with complete post-dentary elements that are well-preserved and detached from the dentary bones. The specimen reveals the transformation of the surangular jaw bone from an independent element into part of the malleus of the middle ear, and the presence of a restricted contact between the columelliform stapes and the flat incus. We propose that the malleus-incus joint is dichotomic in mammaliaforms, with the two bones connecting in either an abutting or an interlocking arrangement, reflecting the evolutionary divergence of the dentary-squamosal joint(4). In our phylogenetic analysis, acquisition of the definitive mammalian middle ear in allotherians such as this specimen was independent of that in monotremes and therians. Our findings suggest that the co-evolution of the primary and secondary jaw joints in allotherians was an evolutionary adaptation allowing feeding with unique palinal (longitudinal and backwards) chewing. Thus, the evolution of the allotherian auditory apparatus was probably triggered by the functional requirements of the feeding apparatus.
资助项目	Chinese Academy of Sciences[XDB18000000] ; Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41802005] ; National Natural Science Foundation of China[41688103] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[183121]
WOS关键词	OSSIFIED MECKELS CARTILAGE ; MULTITUBERCULATE MAMMALS ; ORIGIN
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000501599200048
资助机构	Chinese Academy of Sciences ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/16822]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Wang, Yuanqing
作者单位	1.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 4.Amer Museum Nat Hist, Div Paleontol, New York, NY 10024 USA
推荐引用方式 GB/T 7714	Wang, Haibing,Meng, Jin,Wang, Yuanqing. Cretaceous fossil reveals a new pattern in mammalian middle ear evolution[J]. NATURE,2019,576(7785):102-+.
APA	Wang, Haibing,Meng, Jin,&Wang, Yuanqing.(2019).Cretaceous fossil reveals a new pattern in mammalian middle ear evolution.NATURE,576(7785),102-+.
MLA	Wang, Haibing,et al."Cretaceous fossil reveals a new pattern in mammalian middle ear evolution".NATURE 576.7785(2019):102-+.