Crown morphology and variation of the lower premolars of Zhoukoudian Homo erectus

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	Crown morphology and variation of the lower premolars of Zhoukoudian Homo erectus
	Xing Song 1,2; Zhou Mi 3; Liu Wu1 ; xingsongh@yahoo.com.cn
	2009-11-01
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	54 期号:21 页码:3905-3915
文章类型	Article
摘要	Traditional descriptive observation and advanced geometric morphometric are employed to study the morphological characteristics of Zhoukoudian mandibular premolars, and simultaneously with the specimens of Australopithecus, African early Homo, Homo erectus in other areas of Asia except Zhoukoudian, Europe Pleistocene fossil hominins, and recent Chinese (72 P(3) and 69 P(4) on the whole) being included as comparisons. Results suggest obvious evolutionary changes in the occlusal morphology and crown outline shape of mandibular premolars. Australopithecus P(3)s are found with extremely asymmetrical crown outlines, prominent mesial and distal vertical grooves on the buccal side, open foveas, and well-developed talonids, and P(4)s with similarly asymmetrical crown outlines, distinct mesial and distal vertical grooves on the buccal side, and "H" type of grooves combination. These characteristics are also expressed in the later hominin specimens, but with a decreased extent and lower frequency. The P(3)s of recent Chinese, slightly asymmetrical in the crown lingual contours, and P(4)s, basically symmetrical in the crown outlines, become faint or disappeared in the mesial or distal vertical buccal grooves, and decreased in the talonid size. It is suggested that Zhoukoudian mandibular premolars preserve some primitive traits of earlier hominins, including asymmetrical crown outlines and prominent mesial and distal vertical grooves of buccal side. Moreover, Zhoukoudian specimens exhibit obvious morphological variation between individuals, expressed mainly by aspects of mesial and distal vertical buccal grooves in various degrees, symmetry or asymmetry extent of crown lingual contour, relative location of polygon to the corresponding surrounding outline, as well as the relative size of talonid. When compared with Homo erectus from the other areas of Asia, Zhoukoudian specimens show their similarity with those of Xichuan and S-1, and at the same time great discrepancy with S-6 in the occlusal morphology and crown outline shape. When it comes to the relationship between specimens of Europe Pleistocene and Zhoukoudian, disparity is expressed in a stronger way than the corresponding similarity.
关键词	Shape Geometric Morphometric Zhoukoudian Premolars Fossil Hominins
WOS标题词	Science & Technology
URL	查看原文
关键词[WOS]	GEOMETRIC MORPHOMETRIC-ANALYSIS ; NONMETRIC TRAITS ; HOMINIDS
收录类别	SCI ; SSCI
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000271760400009
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/4697
专题	中科院古脊椎所（2000年以后）古人类及旧石器研究室
通讯作者	xingsongh@yahoo.com.cn
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Evolutionary Systemat Vertebrates, Beijing 100044, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Inst Archeol & Cultural Rel Hubei Prov, Wuhan 430077, Peoples R China
推荐引用方式 GB/T 7714	Xing Song,Zhou Mi,Liu Wu,et al. Crown morphology and variation of the lower premolars of Zhoukoudian Homo erectus[J]. CHINESE SCIENCE BULLETIN,2009,54(21):3905-3915.
APA	Xing Song,Zhou Mi,Liu Wu,&xingsongh@yahoo.com.cn.(2009).Crown morphology and variation of the lower premolars of Zhoukoudian Homo erectus.CHINESE SCIENCE BULLETIN,54(21),3905-3915.
MLA	Xing Song,et al."Crown morphology and variation of the lower premolars of Zhoukoudian Homo erectus".CHINESE SCIENCE BULLETIN 54.21(2009):3905-3915.

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