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Structural analysis of premolar roots in Middle Pleistocene hominins from China
Pan, Lei1,2; Dumoncel, Jean3; Mazurier, Arnaud4; Zanolli, Clement3,5
2019-11-01
Source PublicationJOURNAL OF HUMAN EVOLUTION
ISSN0047-2484
Volume136Pages:13
Abstract

This study investigates permanent maxillary and mandibular premolar root structural organization in East Asian Middle Pleistocene hominins. In addition to reporting and analyzing the linear and volumetric properties of the roots, we used a landmark-free approach to both qualify and quantify in 3D premolar root shape variation of Middle Pleistocene hominins in East Asia. Moreover, we focus on some mid-to late East Asian Middle Pleistocene hominin specimens whose taxonomic attribution is unclear. We find considerable cementum in this sample of hominins, similar to other fossil groups, but clearly different from modern humans which have a very small amount of cementum. Additionally, a smaller root pulp cavity is found in later Homo (Neanderthals and modern humans). Our analyses on the crown-root surface area ratio show that East Asian Middle Pleistocene Homo erectus as well as one late Middle Pleistocene Homo sp. specimen (PA 81 P-4 from Changyang site) are distinguished from other fossil and extant groups by a relatively larger root surface, stout root branches and thick cementum deposits. This may represent a distinct East Asian H. erectus dental pattern. Geometric morphometric analyses on the external root surface reveal a general trend of shape simplification along the Homo lineage examined here, and distinguish Early Pleistocene Homo, Middle Pleistocene H. erectus, Neanderthals and modern human morphologies. The late Middle Pleistocene teeth from Changyang site (PA 76 P-3 and PA 81 P-4 ) are close to East Asian H. erectus and Neanderthals, while the mid-Middle Pleistocene P-3 from Panxian Dadong falls within the modern human distribution. Combined with dental crown morphology and root number/form reported in previous studies, our results show that the external root shape can be considered a taxonomically relevant indicator. In general, an evolutionary tendency towards modern human morphology is observed in part of the East Asian Middle Pleistocene specimens, while a retention of primitive, H. erectus-like features is expressed in some late Middle Pleistocene specimens, supporting a multi-lineage and discontinuous scenario of human settlements in East Asia. (C) 2019 Elsevier Ltd. All rights reserved.

KeywordEast Asian Middle Pleistocene Homo Permanent premolar External root surface Crown-root tissue proportions
DOI10.1016/j.jhevol.2019.102669
Language英语
WOS KeywordENAMEL-DENTIN JUNCTION ; GEOMETRIC MORPHOMETRIC-ANALYSIS ; U-SERIES ; AUSTRALOPITHECUS-AFRICANUS ; BRIEF COMMUNICATION ; CANAL MORPHOLOGY ; PANXIAN DADONG ; HOMO-ERECTUS ; 1ST PREMOLAR ; LOWER MOLARS
Funding ProjectStrategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[41702026] ; National Natural Science Foundation of China[41872030] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[173119] ; French Centre National de la Recherche Scientifique (CNRS)
WOS Research AreaAnthropology ; Evolutionary Biology
WOS SubjectAnthropology ; Evolutionary Biology
WOS IDWOS:000497255100007
Funding OrganizationStrategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) ; French Centre National de la Recherche Scientifique (CNRS)
PublisherACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/29430
Collection中国科学院南京地质古生物研究所
Corresponding AuthorPan, Lei
Affiliation1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Jiangsu, Peoples R China
3.Univ Toulouse III Paul Sabatier, CNRS, UMR 5288, Lab AMIS, Toulouse, France
4.Univ Poitiers, CNRS, UMR 7285, Inst Chim Milieux & Mat, F-86073 Poitiers, France
5.Univ Bordeaux, CNRS, UMR 5199, Lab PACEA, Bordeaux, France
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Pan, Lei,Dumoncel, Jean,Mazurier, Arnaud,et al. Structural analysis of premolar roots in Middle Pleistocene hominins from China[J]. JOURNAL OF HUMAN EVOLUTION,2019,136:13.
APA Pan, Lei,Dumoncel, Jean,Mazurier, Arnaud,&Zanolli, Clement.(2019).Structural analysis of premolar roots in Middle Pleistocene hominins from China.JOURNAL OF HUMAN EVOLUTION,136,13.
MLA Pan, Lei,et al."Structural analysis of premolar roots in Middle Pleistocene hominins from China".JOURNAL OF HUMAN EVOLUTION 136(2019):13.
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