Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water

doi:10.1073/pnas.2002146117

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	Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water
	Schwab, Julia A.2; Young, Mark T.2; Neenan, James M.3; Walsh, Stig A.2,4; Witmer, Lawrence M.5; Herrera, Yanina 6; Allain, Ronan 7; Brochu, Christopher A.8; Choiniere, Jonah N.9; Clark, James M.10
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2020-05-12
卷号	117 期号:19 页码:10422-10428
关键词	bony labyrinth vestibular system morphology thalattosuchia CT scanning
ISSN号	0027-8424
DOI	10.1073/pnas.2002146117
英文摘要	Major evolutionary transitions, in which animals develop new body plans and adapt to dramatically new habitats and lifestyles, have punctuated the history of life. The origin of cetaceans from land-living mammals is among the most famous of these events. Much earlier, during the Mesozoic Era, many reptile groups also moved from land to water, but these transitions are more poorly understood. We use computed tomography to study changes in the inner ear vestibular system, involved in sensing balance and equilibrium, as one of these groups, extinct crocodile relatives called thalattosuchians, transitioned from terrestrial ancestors into pelagic (open ocean) swimmers. We find that the morphology of the vestibular system corresponds to habitat, with pelagic thalattosuchians exhibiting a more compact labyrinth with wider semicircular canal diameters and an enlarged vestibule, reminiscent of modified and miniaturized labyrinths of other marine reptiles and cetaceans. Pelagic thalattosuchians with modified inner ears were the culmination of an evolutionary trend with a long semiaquatic phase, and their pelagic vestibular systems appeared after the first changes to the postcranial skeleton that enhanced their ability to swim. This is strikingly different from cetaceans, which miniaturized their labyrinths soon after entering the water, without a prolonged semiaquatic stage. Thus, thalattosuchians and cetaceans became secondarily aquatic in different ways and at different paces, showing that there are different routes for the same type of transition.
资助项目	National Natural Science Foundation of China[41688103] ; Humboldt Research Fellowship from the Alexander von Humboldt Foundation ; Leverhulme Trust Research Project[RPG-2017-167] ; Leverhulme Trust Early Career Fellowship[ECF-2017-360] ; ANPCyT[PICTs 2016-0267] ; ANPCyT[2016-1039] ; National Science Foundation[DEB 1754659] ; National Science Foundation[DEB 1754596] ; Carl Gans Fund
WOS关键词	EVOLUTION ; RATES ; THALATTOSUCHIA ; BEHAVIOR ; REPTILES ; EOCENE ; SIZE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000532837500043
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/17464]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Schwab, Julia A.
作者单位	1.North Carolina State Univ, Dept Biol Sci, Raleigh, NC 27695 USA 2.Univ Edinburgh, Grant Inst, Sch GeoSci, Edinburgh EH9 3FE, Midlothian, Scotland 3.Univ Oxford, Museum Nat Hist, Oxford OX1 3PW, England 4.Natl Museum Scotland, Dept Nat Sci, Edinburgh EH1 1JF, Midlothian, Scotland 5.Ohio Univ, Heritage Coll Osteopath Med, Dept Biomed Sci, Athens, OH 45701 USA 6.Natl Univ La Plata, Fac Ciencias Nat & Museo, Museo La Plata, CONICET,Div Paleontol Vertebrados, B-1900 La Plata, Buenos Aires, Argentina 7.Museum Natl Hist Nat, Ctr Rech Paleobiodivers & Les Paleoenvironm, F-75005 Paris, France 8.Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA 52242 USA 9.Univ Witwatersrand, Evolutionary Studies Inst, ZA-2000 Johannesburg, South Africa 10.George Washington Univ, Dept Biol Sci, Washington, DC 20052 USA
推荐引用方式 GB/T 7714	Schwab, Julia A.,Young, Mark T.,Neenan, James M.,et al. Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(19):10422-10428.
APA	Schwab, Julia A..,Young, Mark T..,Neenan, James M..,Walsh, Stig A..,Witmer, Lawrence M..,...&Brusatte, Stephen L..(2020).Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(19),10422-10428.
MLA	Schwab, Julia A.,et al."Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.19(2020):10422-10428.