Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12136/2144
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Title: Middle Pleistocene hominin teeth from Longtan Cave, Hexian, China
Authors: Xing, Song
Martinón-Torres, María
Bermúdez de Castro, José María
Zhang, Yingqi
Fan, Xiaoxiao
Zheng, Longting
Huang, Wanbo
Liu, Wu
Keywords: Pleistocene epoch;Hominins;Teeth;Dentin;Molars;Neanderthals;Paleobiology;Australopithecus
Issue Date: Dec-2014
Publisher: Public Library of Science
Citation: PLoS ONE, 2014, 9 (12): e114265
Abstract: Excavations at the Longtan Cave, Hexian, Anhui Province of Eastern China, have yielded several hominin fossils including crania, mandibular fragments, and teeth currently dated to 412±25 ka. While previous studies have focused on the cranial remains, there are no detailed analyses of the dental evidence. In this study, we provide metric and morphological descriptions and comparisons of ten teeth recovered from Hexian, including microcomputed tomography analyses. Our results indicate that the Hexian teeth are metrically and morphologically primitive and overlap with H. ergaster and East Asian Early and mid-Middle Pleistocene hominins in their large dimensions and occlusal complexities. However, the Hexian teeth differ from H. ergaster in features such as conspicuous vertical grooves on the labial/buccal surfaces of the central incisor and the upper premolar, the crown outline shapes of upper and lower molars and the numbers, shapes, and divergences of the roots. Despite their close geological ages, the Hexian teeth are also more primitive than Zhoukoudian specimens, and resemble Sangiran Early Pleistocene teeth. In addition, no typical Neanderthal features have been identified in the Hexian sample. Our study highlights the metrical and morphological primitive status of the Hexian sample in comparison to contemporaneous or even earlier populations of Asia. Based on this finding, we suggest that the primitive-derived gradients of the Asian hominins cannot be satisfactorily fitted along a chronological sequence, suggesting complex evolutionary scenarios with the coexistence and/or survival of different lineages in Eurasia. Hexian could represent the persistence in time of a H. erectus group that would have retained primitive features that were lost in other Asian populations such as Zhoukoudian or Panxian Dadong. Our study expands the metrical and morphological variations known for the East Asian hominins before the mid-Middle Pleistocene and warns about the possibility that the Asian hominin variability may have been taxonomically oversimplified.
URI: http://hdl.handle.net/20.500.12136/2144
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0114265
Editor version: https://doi.org/10.1371/journal.pone.0114265
Type: Article
Appears in Collections:Paleobiología

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