Jurassic shuotheriids show earliest dental diversification of mammaliaforms

doi:10.1038/s41586-024-07258-7

IVPP-IR

	Jurassic shuotheriids show earliest dental diversification of mammaliaforms
	Mao, Fangyuan 1,2; Li, Zhiyu 3; Wang, Zhili 3; Zhang, Chi 1; Rich, Thomas 4,5; Vickers-Rich, Patricia 4,5,6; Meng, Jin2,7
	2024-04-18
发表期刊	NATURE
ISSN	0028-0836
卷号	628 期号:8008 页码:25
通讯作者	Mao, Fangyuan(maofangyuan@ivpp.ac.cn) ; Meng, Jin(jmeng@amnh.org)
摘要	Shuotheriids are Jurassic mammaliaforms that possess pseudotribosphenic teeth in which a pseudotalonid is anterior to the trigonid in the lower molar, contrasting with the tribosphenic pattern of therian mammals (placentals, marsupials and kin) in which the talonid is posterior to the trigonid(1-4). The origin of the pseudotribosphenic teeth remains unclear, obscuring our perception of shuotheriid affinities and the early evolution of mammaliaforms(1,5-9). Here we report a new Jurassic shuotheriid represented by two skeletal specimens. Their complete pseudotribosphenic dentitions allow reidentification of dental structures using serial homology and the tooth occlusal relationship. Contrary to the conventional view(1,2,6,10,11), our findings show that dental structures of shuotheriids can be homologized to those of docodontans and partly support homologous statements for some dental structures between docodontans and other mammaliaforms(6,12). The phylogenetic analysis based on new evidence removes shuotheriids from the tribosphenic ausktribosphenids (including monotremes) and clusters them with docodontans to form a new clade, Docodontiformes, that is characterized by pseudotribosphenic features. In the phylogeny, docodontiforms and 'holotherians' (Kuehneotherium, monotremes and therians)(13) evolve independently from a Morganucodon-like ancestor with triconodont molars by labio-lingual widening their posterior teeth for more efficient food processing. The pseudotribosphenic pattern passed a cusp semitriangulation stage(9), whereas the tribosphenic pattern and its precursor went through a stage of cusp triangulation. The two different processes resulted in complex tooth structures and occlusal patterns that elucidate the earliest diversification of mammaliaforms.
DOI	10.1038/s41586-024-07258-7
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001401542500001
出版者	NATURE PORTFOLIO
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/24246
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Mao, Fangyuan; Meng, Jin
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing, Peoples R China 2.Amer Museum Nat Hist, Div Paleontol, New York, NY 10024 USA 3.Inner Mongolia Museum Nat Hist, Hohhot, Peoples R China 4.Museums Victoria, Melbourne, Vic, Australia 5.Monash Univ, Sch Earth Atmosphere & Environm, Melbourne, Vic, Australia 6.Curtin Univ, Sch Earth & Planetary Sci, Perth, WA, Australia 7.CUNY, Earth & Environm Sci, New York, NY 10021 USA
推荐引用方式 GB/T 7714	Mao, Fangyuan,Li, Zhiyu,Wang, Zhili,et al. Jurassic shuotheriids show earliest dental diversification of mammaliaforms[J]. NATURE,2024,628(8008):25.
APA	Mao, Fangyuan.,Li, Zhiyu.,Wang, Zhili.,Zhang, Chi.,Rich, Thomas.,...&Meng, Jin.(2024).Jurassic shuotheriids show earliest dental diversification of mammaliaforms.NATURE,628(8008),25.
MLA	Mao, Fangyuan,et al."Jurassic shuotheriids show earliest dental diversification of mammaliaforms".NATURE 628.8008(2024):25.