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Title: Interproximal grooves on the Middle Pleistocene hominin teeth from Yiyuan, Shandong Province: new evidence for tooth-picking behavior from eastern China
Authors: Sun, Chengkai
Xing, Song
Martín-Francés, Laura
Bae, Christopher J.
Liu, Liqun
Wei, Guangbiao
Liu, Wu
Keywords: Interproximal groove;Yiyuan;Eastern China;Homo erectus;Tooth-picking behavior
Issue Date: Dec-2014
Publisher: Elsevier
Citation: Quaternary International, 2014, 354, 162-168
Abstract: An assortment of hominin cranial and seven dental fossils assigned to Homo erectus were discovered in 1981 and 1982 at Yiyuan, a Middle Pleistocene fissure site in Shandong Province, eastern China. The present study analyzes microscopically the seven teeth interproximal surfaces from Yiyuan using a binocular microscope and Scanning Electron Microscopy. The crowns and roots of the teeth exhibit different degrees of wear, which range from multiple fine striae to deep interproximal grooves. The location, morphology, and dimension of these grooves or striae are similar to artificial wear caused by habitual tooth-picking. The Yiyuan teeth provide one of the earliest evidence of tooth-picking among Pleistocene hominins in eastern Asia.
ISSN: 1040-6182
DOI: 10.1016/j.quaint.2014.03.008
Type: Article
Appears in Collections:Paleobiología

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