Molar crown formation times of fossil orangutan molars from Guangxi, China

doi:10.1002/ajpa.24183

	Molar crown formation times of fossil orangutan molars from Guangxi, China
	Hu, Rong 2; Zhao, Lingxia 1
刊名	AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY
	2020-11-30
页码	12
关键词	crown formation time fossil orangutan Guangxi
ISSN号	0002-9483
DOI	10.1002/ajpa.24183
通讯作者	Hu, Rong(hurong314@xmu.edu.cn) ; Zhao, Lingxia(zhaolingxia@ivpp.ac.cn)
英文摘要	Objectives We aimed to investigate molar enamel development in fossil orangutans from Guangxi and shed light on the evolution of Asian great apes. Materials and methods We collected 32 fossil orangutan molars, most of which were from Guangxi apothecaries and the Guangxi Daxin Heidong cave, and prepared histological sections of each molar. We then characterized aspects of dental development, including long period line periodicity, number of Retzius lines and lateral enamel formation time, cuspal enamel thickness, and enamel formation time. Results The long period line periodicity in fossil orangutans ranged from 9 to 10 days (mean, 9.09 days). The molar lateral enamel formation time ranged from 1.48 to 3.17 years (540-1,152 days). Cuspal enamel thickness in fossil orangutan molars ranged from 949 to 2,535 mu m, and cuspal enamel formation time ranged from 0.64 to 1.87 years. Molar enamel formation time of fossil orangutans ranged from 2.47 to 4.67 years. Discussion Long-period line periodicity of fossil orangutans from Guangxi was within the variation range of extant orangutans, and the average long period line periodicity (9.09 days) of fossil orangutans from Guangxi in this study was lower than the values for extant orangutans (9.5 days) and fossil orangutans (10.9 days) from Sumatra and Vietnam. Orangutan enamel thickness may have gradually decreased from the Middle Pleistocene to Holocene. Crown formation time of fossil orangutans was slightly longer than that of extant orangutans, and the M1 emergence age of fossil orangutans from Guangxi was about 4-6 years. These findings might indicate the regional difference or evolutionary changes in orangutans since Pleistocene. Dental development of the Guangxi fossil orangutans were more similar to that of Asian Miocene apes, suggesting the closer evolutionary relationship of orangutans to Miocene Asian fossil apes.
资助项目	National Natural Science Foundation of China[41502009] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000-XDB26030104]
WOS关键词	DENTAL DEVELOPMENT ; LIFE-HISTORY ; ENAMEL THICKNESS ; HISTOLOGICAL RECONSTRUCTION ; SUMATRAN ORANGUTAN ; PONGO ; MICROSTRUCTURE ; EVOLUTION ; AFRICAN ; CHONGZUO
WOS研究方向	Anthropology ; Evolutionary Biology
语种	英语
出版者	WILEY
WOS记录号	WOS:000594217700001
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/18836]
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Hu, Rong; Zhao, Lingxia
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 2.Xiamen Univ, Dept Anthropol & Ethol, Inst Anthropol, Xiamen 361005, Peoples R China
推荐引用方式 GB/T 7714	Hu, Rong,Zhao, Lingxia. Molar crown formation times of fossil orangutan molars from Guangxi, China[J]. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY,2020:12.
APA	Hu, Rong,&Zhao, Lingxia.(2020).Molar crown formation times of fossil orangutan molars from Guangxi, China.AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY,12.
MLA	Hu, Rong,et al."Molar crown formation times of fossil orangutan molars from Guangxi, China".AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY (2020):12.