globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2012437117
论文题名:
The earliest-known mammaliaform fossil from Greenland sheds light on origin of mammals
作者: Sulej T.; Krzesinski G.; Tałanda M.; Wolniewicz A.S.; Błażejowski B.; Bonde N.; Gutowski P.; Sienkiewicz M.; Niedzwiedzki G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:43
起始页码: 26861
结束页码: 26867
语种: 英语
英文关键词: Complex occlusion ; Greenland ; Late Triassic ; Mammaliaform ; Multirooted tooth
Scopus关键词: article ; cladistics ; feeding ; finite element analysis ; fossil ; Greenland ; mammal ; mandible ; mechanical stress ; nonhuman ; tooth occlusion ; tooth root ; Upper Triassic
英文摘要: Synapsids are unique in having developed multirooted teeth and complex occlusions. These innovations evolved in at least two lineages of mammaliamorphs (Tritylodontidae and Mammaliaformes). Triassic fossils demonstrate that close to the origins of mammals, mammaliaform precursors were “experimenting” with tooth structure and function, resulting in novel patterns of occlusion. One of the most surprising examples of such adaptations is present in the haramiyidan clade, which differed from contemporary mammaliaforms in having two rows of cusps on molariform crowns adapted to omnivorous/herbivorous feeding. However, the origin of the multicusped tooth pattern present in haramiyidans has remained enigmatic. Here we describe the earliest-known mandibular fossil of a mammaliaform with double molariform roots and a crown with two rows of cusps from the Late Triassic of Greenland. The crown morphology is intermediate between that of morganucodontans and haramiyidans and suggests the derivation of the multicusped molariforms of haramiyidans from the triconodont molar pattern seen in morganucodontids. Although it is remarkably well documented in the fossil record, the significance of tooth root division in mammaliaforms remains enigmatic. The results of our biomechanical analyses (finite element analysis [FEA]) indicate that teeth with two roots can better withstand stronger mechanical stresses like those resulting from tooth occlusion, than teeth with a single root. © 2020 National Academy of Sciences. All rights reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163372
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Sulej, T., Institute of Paleobiology, Polish Academy of Sciences, Warsaw, 00-818, Poland; Krzesinski, G., Faculty of Power and Aeronautical Engineering, Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Warsaw, 00-665, Poland; Tałanda, M., Department of Paleobiology and Evolution, Faculty of Biology, Biological and Chemical Research Centre, University of Warsaw, Warsaw, 02-089, Poland; Wolniewicz, A.S., Institute of Paleobiology, Polish Academy of Sciences, Warsaw, 00-818, Poland, Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Błażejowski, B., Institute of Paleobiology, Polish Academy of Sciences, Warsaw, 00-818, Poland; Bonde, N., Geological Section, Natural History Museum of Denmark, University of Copenhagen, Copenhagen, DK-2100, Denmark, Fur Museum, Fur, 7884, Denmark; Gutowski, P., Department of Cranio-Maxillofacial Surgery, Oral Surgery and Implantology, Medical University of Warsaw, Warsaw, 02-091, Poland; Sienkiewicz, M., Faculty of Power and Aeronautical Engineering, Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Warsaw, 00-665, Poland; Niedzwiedzki, G., Department of Organismal Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, 752 36, Sweden

Recommended Citation:
Sulej T.,Krzesinski G.,Tałanda M.,et al. The earliest-known mammaliaform fossil from Greenland sheds light on origin of mammals[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(43)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Sulej T.]'s Articles
[Krzesinski G.]'s Articles
[Tałanda M.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Sulej T.]'s Articles
[Krzesinski G.]'s Articles
[Tałanda M.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Sulej T.]‘s Articles
[Krzesinski G.]‘s Articles
[Tałanda M.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.