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    Somatotype characteristics of the She people in Fujian
    HU Rong
    Acta Anthropologica Sinica    2021, 40 (05): 824-833.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0027
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    According to historical records, She people had lived at the junction of Guangdong, Fujian and Jiangxi before Tang Dynasty. Today She people are mainly distributed in seven provinces, including Fujian, Zhejiang, Jiangxi, Guangdong, Anhui, Hunan and Guizhou. However, there has been a great controversy about the origin and migration of She people. In this study, we randomly selected 504 She nationality adults (285 males and 219 females) aged above18 years old from Fu’an city and Fuding city of Fujian Province, with measuring 10 Physical parameters including stature, weight, biepicondylar breadth of the humerus, biepicondylar breadth of the femur, circumference of tensed arm, circumference of claf, thickness of triceps skinfold, subscapular skinfold, supraspinale skinfold and middle calf skinfold. The Heath-Carter somatotype method was used to analyze the somatotype of She people in eastern Fujian. The average somatotype of She males (5.02-3.76-1.76) was endodermic, while the average somatotype of females (6.91-3.50-1.23) was endodermic. Compared with other southern ethnic minorities in China, the results show that somatotype of She people is closer to Han groups, especially the Han people from southern and eastern Fujian, and Han people from Guangxi, but more different from southern ethnic minority, which suggested that formation process of She nationality is closely related to Han nationality. This study provides the biological clue for origin of She, and also provides the necessary data and materials for the anthropological research in China.

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    Possible rheumatoid arthritis found in a human sacrifice skeleton from the Eastern Zhou tomb of Songzhuang village, Qi county, Henan province
    SUN Lei
    Acta Anthropologica Sinica    2022, 41 (02): 248-260.   DOI: 10.16359/j.1000-3193/AAS.2021.0033
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    The purpose of this study is to describe and analyze the evidence for rheumatoid arthritis in a sample of human sacrifice skeleton uncovered from a noble tomb of eastern Zhou period at Qixian Songzhuang cemetery in Henan Province. The human sacrifice is characterized by numerous symmetrical surface erosions in the joints of the shoulder, elbow, wrist and hand, hip, knee, ankle, and foot. Radiographs revealed that osteoporosis was evident in the joints with erosions. The possibility of seronegative spondyloarthropathies cannot be completely ruled out due to the lack of preservation of all the vertebrae and both sacroiliac joints. However, by comparing the major differential signs for diagnosing various joint diseases, rheumatoid arthritis is suggested as the most probable cause of this pathology in the human sacrifice skeleton.

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    A review of lithic technology and implied human behaviors from some typical Acheulean sites
    LI Hao, LEI Lei, LI Dawei, ZHANG Meng
    Acta Anthropologica Sinica    2022, 41 (02): 354-369.   DOI: 10.16359/j.1000-3193/AAS.2021.0011
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    New research in recent years has obtained a series of achievements on our understanding of technological characteristics of the Acheulean Techno-complex in China. However, few studies in the region have focused on deep-seated issues regarding hominid social behaviors. In this paper, we present a review of social behavioral studies in three well-known Acheulean sites (i.e., Olorgesailie in Kenya, Gesher Benot Ya’aqov in Israel and Boxgrove in England) outside of China. We suggest that the technological strategies or material cultures can be thought as important reflections or expressions of invisible social behaviors, the latter consisting of an essential aspect in understanding the mechanisms and processes of human cultural evolution in the Stone Age. Therefore, in addition to investigating the archaeological records, social behavioral information that implied in these records will also need to be carefully unveiled, through which we can contribute to a better explanation of “the muddle in the middle” in human evolution.

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    A methodological protocol for the analysis of Early Stone Age lithic assemblages
    Ignacio de la TORRE, Rafael MORA, PEI Shuwen, MA Dongdong
    Acta Anthropologica Sinica    2021, 40 (04): 547-567.   DOI: 10.16359/j.1000-3193/AAS.2021.0046
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    This paper proposes an analytical protocol for the study of early Palaeolithic stone tools. Our proposal follows a macroscopic approach and therefore does not cover the equally-important analysis of microscopic traces. Also, it focuses on techno-typological attributes of pre-Middle Palaeolithic artefact, thus avoiding entering into the discussion of the techno-morphological and regional particularities inherent to the lithic record from the Middle Stone Age onwards. Given the overall similarities of technological solutions employed during the Early Stone Age lithic assemblages and their relative typological homogeneity across the Old World, we argue that using standardized protocols in the description of stone tool collections may improve comparability and help understanding global patterns of technological behaviour across the early Palaeolithic. From this perspective, this paper will review the main theoretical approaches to the study of Early Stone Age stone assemblages and will propose analytical perspectives and terminologies in the description of flaked, detached and pounded tools, as well in the study of refits and conventions in artefact measuring and illustration.

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    Canine fossa and evolution of the human mid-facial bones
    Francesc RIBOT Trafí, Mario GARCÍA Bartual, Alfredo José ALTAMIRANO Enciso, Qian WANG
    Acta Anthropologica Sinica    2022, 41 (02): 193-217.   DOI: 10.16359/j.1000-3193/AAS.2020.0016
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    The canine fossa is an important feature in the facial skeleton of many hominins, including modern humans. However, its phylogenetic significance is debated. Some researchers consider it as a plesiomorphic characteristic in a generalized face that, with some exceptions, is found in both extinct and extant great apes and in the hominins. Others consider that the canine fossa is a derived characteristic only found in Homo sapiens and its direct ancestors, and that it is related to an arched zygomatic-alveolar crest (ZAC). However, this relationship is not always fulfilled, and in Homo sapiens, there is a notable variability: An arched ZAC with the presence or absence of a canine fossa, and straight oblique ZAC with presence or absence of a canine fossa. In this sense, we hypothesize that the canine fossa is related to the degree of anterior extension of the maxillary sinus and that the morphology of the ZAC is related to the degree of lateral extension of said sinus. During the hominine evolution, the canine fossa has undergone different transformations, such as the maxillary furrow (Australopithecus africanus, Paranthropus robustus), maxillary fossula (P. robustus), and the sulcus maxillaris (Homo ergaster), or has been obliterated (Paranthropus aethiopicus, Paranthropus boisei, Kenyanthropus platyops, Homo rudolfensis). In the taxa where it has been obliterated, the mechanism of obliteration is different in the hominins of the Pliocene and Early Pleistocene compared to those of the Middle Pleistocene (Homo heidelbergensis/rhodesiensis, Homo nenaderthalensis). The facial morphology of H. rhodesiensis would exclude it from the line evolving to H. sapiens.

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    Chronology of lithic artifact sites and hominin distribution from Early to Middle Pleistocene in China
    LU Ying, SUN Xuefeng, WANG Shejiang, LU Huayu
    Acta Anthropologica Sinica    2021, 40 (03): 411-426.   DOI: 10.16359/j.1000-3193/AAS.2021.0038
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    Hominin fossils and Paleolithic sites of Early and Middle Pleistocene in China can provide information to understand hominin behavioral and living environments, while a chronological framework is the basis for analyzing hominin evolution, migration, and relationship with climate change during the Pleistocene era. In the past 20 years, hominin records in China steadily increased because of the Paleolithic excavation and the advancement of dating techniques, providing amplified materials for establishing age frameworks. This study analyzed 95 Early to Middle Pleistocene sites with numerical age estimates. The distribution patterns are shown under the loess-paleosol chronology constraints and a relatively continuous chronology of hominin activities is established from approximately 2 MaBP to the last interglacial period. These sites are mainly distributed in four regions of the Nihewan Basin and the adjacent Zhoukoudian, Qingling Mountains Range, and lower reaches of the Yangtze River and South China, where the maximum intensity of hominin activities occurred in order during the Early Pleistocene, Middle Pleistocene, and in the late part of Middle Pleistocene, respectively. Various excavated sites still lack chronological study or encounter issues in dating. Therefore, improvement of chronological study is necessary.

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    Discussion on the Mesolithic Age
    Chen Chun
    Acta Anthropologica Sinica    1995, 14 (01): 82-90.  
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    Progress and prospects on osteological study of ancient human remains in China
    HE Jianing
    Acta Anthropologica Sinica    2021, 40 (02): 165-180.   DOI: 10.16359/j.1000-3193/AAS.2021.0016
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    The osteological study of ancient human remains is an important part of physical anthropology, which has a history of more than one hundred years in China. Significant advances have been made in the last decade. In this paper, the progress of osteological study of Holocene human remains in China is reviewed.
    In the last ten years, the fields of research have expanded significantly, including population evolution history, paleopathology, skeletal abnormalities related to cultural customs, functional adaptation of long bones, paleodemography, body shape and size, climate adaptation, etc., and have accumulated many important physical data of ancient populations. The breadth and depth of the research have completely surpassed the situation that focused on ethnographic analysis in the last century.
    In addition to traditional methods based on metric and non-metric traits of skull and teeth, evolutionary quantitative genetic method has been introduced into regional population history study. There are also microevolutionary analysis of craniofacial morphologies on large spatial and temporal scale. Geometric morphometrics has proved to be of great value in the study of population history. In the study of paleopathology, there are some regional comparative researches focus on stress conditions, dental diseases, trauma, etc. Particular attention has been paid to the impact of social, cultural, and subsistence background on the pattern of disease. Biomechanics and geometric morphometrics have been used to analyze the long bone function, which provides important information for the reconstruction of activity patterns of past humans. New methods such as digital photography, micro-CT and 3D laser scanning, geometric morphology and morphometric maps have played an important role in supporting these progresses.
    Most studies highlight the significant advantages of multidisciplinary and interdisciplinary research, which is also essential for the future study. However, there are still some fields to be explored in China, such as the osteological study of children, female and physical adaptation to the environment. Basic research of osteology also needs to be strengthened.

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    Ancient DNA capture techniques and genetic study progress of early southern China populations
    WANG Tianyi, ZHAO Dongyue, ZHANG Ming, QIAO Shiyu, YANG Fan, WAN Yang, YANG Ruowei, CAO Peng, LIU Feng, FU Qiaomei
    Acta Anthropologica Sinica    2020, 39 (04): 680-694.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0059
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    Substantial development of the ancient DNA capture techniques allows for obtaining DNA from a wide range of materials, including bone and environmental sediments. Moreover, effective endogenous DNA fragments are also obtainable from low-latitude regions with poor preservation conditions, greatly enriching the material sources for ancient DNA research. This paper summarizes and discusses this new technology in two main aspects: 1) it summarizes and presents the potential application of this technology; and 2) it reviews the knowledge gained from the application of this new technology to the study of ancient genomes. Specifically, this paper focuses on the study of ancient genomes from southern China and covers three points. First, we reveal the new insights gained from the study of ancient genomes. Second, we provide an in-depth analysis of the differences among ancient genomes of early populations in southern China. Third, we discuss the use of ancient DNA capture technology in successfully obtaining high quality mitochondrial genomic information from four individuals (3446-3180 cal BP) of Dayin Cave site in Yunnan Province.

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    Application of dental microwear in diets reconstruction
    HUA Licheng, Peter S UNGAR
    Acta Anthropologica Sinica    2021, 40 (02): 292-306.   DOI: 10.16359/j.cnki.cn11-1963/q.2019.0044
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    Dental microwear analysis is the study of microscopic scratches and pits that form on teeth as the result of their use. The pattern of microwear on a tooth is distinctive and varies with foods eaten, so can be used as a proxy for diet. Dental microwear therefore has the potential to provide important insights into paleoecology and evolution of extinct forms. This paper introduces the application of dental microwear analysis as a simple and efficient method of diet reconstruction for the fields of bioarchaeology and paleontology. The principal approaches used to relate pattern of microwear to diet will be presented. Further, current understandings of the etiology of dental microwear will be summarized. In addition, methods of texture analysis applied to dental microwear surfaces will be reviewed. Finally, possible directions for future research on dental microwear will be proposed.

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    Physical characteristics of the Buriats in China
    LI Yong-lan; ZHENG Lian-bin; LU Shun-hua; DONG Qigeqi; LIU Hai-yan; XIE Bin; ZHANG Xing-hua
    Acta Anthropologica Sinica    2011, 30 (04): 357-367.  
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    Buriats are ethnic groups of cross-border distribution, with those of China living in Inner Mongolia. In August 2007 we investigated the physical characteristics of 310 Buriat adults ( 152 males and 158 females), with the following results. In ethnic groups of the North Asian type of Mongoloid, the percentage of eye-fold of the upper eyelid is 49. 34% in males and 58. 23% in feamles. The percentage of Mongoloid Fold is lower with 52. 63% in males and 48. 10% in females. The colors of eye and skin are lighter. The typical physical characteristics of Buriats include hyperbrachycephaly, hypsicephalic type, mesocephaly, mesoprosopy, mesorrhiny, broad chest circumference, medium shoulder breadth, narrow distance between iliac crests, mesatiskelic type, medium length of trunk and squat-type. Euryprosopy is of the highest frequency in the Buriats. Typical physical characteristics of males are super-medium stature, while those of female are of medium stature. The physical characteristics of Buriats belong to a branch of the Central Asian type of the South Asian type of Mongoloid, which also includes Eurasian origins. The physical characteristics of the Buriats are close to ethnic groups of Mongols, but there are also some distinct differences between these two groups.
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    Progress and issues of chronological studies of human fossil sites in China
    GE Junyi, DENG Chenglong, SHAO Qingfeng, PEI Shuwen, TANG Ruiping, TU Hua, GAO Xing
    Acta Anthropologica Sinica    2021, 40 (03): 393-410.   DOI: 10.16359/j.1000-3193/AAS.2021.0061
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    The abundant ancient human remains in China provide important basic evidence and data for the study of the human origin, migration and evolution in East Asia or even the world. However, based on the compilation and statistical analysis of the published chronological data of more than 2000 Paleolithic and human fossil sites, we surprisingly found that most of these sites in China have never been dated, and less than 20% of them have carried out dating work. In addition, only about 10% of these sites have relatively reliable chronological data, but only with a small proportion have even carried out cross-dating with multiple dating methods. For more than 80 sites where human fossils were unearthed, the geochronometry data of more than a half still remain controversial. Here, we conducted a detailed analysis of the common complex syn-deposition and post-deposition reworking phenomena in some paleolithic and human fossil sites, especially the cave sites, and discussed the issues of the insufficient dating platform and geochronological researchers in China, the archaeological excavation process, and the chronological sampling and dating methodology, as well the possible ill effects on the chronological study of the Paleolithic and human fossils sites in China by them. Then, possible measures and suggestions for the future improvement in anthropological chronology research in China have been proposed. We hoped that these improving suggestions may attract more attention and deeper thinking for the perspectives of this research field.

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    A study of skull morphology of Yangshao Culture residents from the Sunzhuang site in Zhengzhou
    ZHOU Yawei, ZHANG Xiaoran, GU Wanfa
    Acta Anthropologica Sinica    2021, 40 (04): 611-627.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0036
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    The Sunzhuang site, located in the south of Sunzhuang Village, Zhongyuan District, Zhengzhou City, Henan Province, is a late Yangshao cultural site distributed in the middle and lower reaches of the Yellow River. Through the measurement and observation of 10 cases of basically intact skulls unearthed from the site, the following conclusions are drawn: The craniofacial features of Sunzhuang group can be summarized as follows: high cranial type combined with narrow cranial type, moderate to large facial flatness, narrow frontal type, middle nasal type, low orbital type, middle facial angle belonging to flat jaw type, underdeveloped canine dentate fossa and nasal root fossa. Simple parietal suture. The morphological characteristics of the skulls of the ancient residents of the Sunzhuang formation belong to the Asian Mongolian nationality. The results of the multivariate statistical analysis of the morphological characteristics of the skull showed that the Sunzhuang formation is most closely related to the modern South China formation (R=1.26) of Asian Mongolians, and is estranged from the modern Mongolian group (R=1.80) and Tungus group (R=2.06). In comparison with Neolithic formation, the relationship between Sunzhuang male formation and Yangshao merge formation (R=1.00), Miaozigou formation (R=1.00), Xishan formation (R=1.07) and Dawenkou formation (R=1.13) is close. Sunzhuang female group is closest to Dawenkou group (Dij=3.10), Xubao group (Dij=4.58) and Xishan group (Dij=4.60). In summary, We can see that the middle and late Yangshao people distributed in the middle and lower reaches of the Yellow River have the same craniofacial characteristics and high homology, and should belong to the “ancient Central Plains type” residents.

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    Acta Anthropologica Sinica    2020, 39 (04): 509-510.  
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    Phylogenetic reconstruction of Gigantopithecus blacki using palaeoproteomic analysis
    WANG Wei
    Acta Anthropologica Sinica    2020, 39 (04): 717-726.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0047
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    Gigantopithecus blacki is the largest hominoid that ever lived in southern China during Pleistocene epoch. Based on its highly specialized dentognathic anatomy, especially extremely large dentition and mandible size, this giant species is estimated to have a body mass of at least 200 kg. So far, chronological and biostratigraphic evidences indicate that G. blacki occupation ranged from 2 MaBP to 0.3 MaBP. The origins and evolution of this animal are controversial for long time, due to the absence of geological fossil record in late Miocene to Pliocene. In Nature (2019) we reported a proteome study on tooth enamel of G. blacki in Chuifeng cave of early Pleistocene (1.9 MaBP) in Bubing Basin, southern China[1]. We identified no endogenous proteins from the dentine, but instead recovered an ancient enamel proteome composed of 409 unique peptides matching 6 endogenous proteins. We demonstrate that G. blacki is a sister clade to orangutans (genus Pongo) with a common ancestor about 12~10 MaBP. This is the first time that molecular evidence is retrieved from such ancient fossil in the subtropical region, further suggesting that the study of ancient proteins will provide strong support for the exploration of the origin and evolution of extinct species, including hominins. In addition, this paper will also briefly review the history of phylogenetic and divergence discussion of Gigantopithecus and introduce the proceeding of the ancient proteins study.

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    Ancient mitogenomes reveals Holocene human population history in the Nenjiang River valley
    LI Chunxiang, ZHANG Fan, MA Pengcheng, WANG Lixin, CUI Yinqiu
    Acta Anthropologica Sinica    2020, 39 (04): 695-705.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0058
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    The Nenjiang River valley is one of the most important settlements for ancient Chinese people in northeast China. Archaeological research demonstrates that the inhabitants had practiced mixed hunting-gathering-fishing since the Neolithic Age, only began to engage in animal husbandry and limited millet cultivation until the late Neolithic Age and early Bronze Age. A problem remained about whether it was a transfer of culture and technology or if it involved the migration of people who experimented with animal husbandry and limited millet cultivation and then brought them to Nenjiang River valley. Here we successfully sequenced 24 complete mitochondrial DNA genomes of 11000 to 2000-year-old humans from the Nenjiang River Valley. The results show that the Bronze / Iron Age populations of Nenjiang River valley matrilineal received partial contribution from the populations of the West Liao River, despite some level of continuity between Neolithic Age groups and Bronze / Iron Age. Combining paleoclimatology, archaeology, and linguistics, we estimate that the ancient people of West Liao River had migrated to the Nenjiang River valley carried their cultural techniques and languages between 4,000 and 3,000 years ago.

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    Endocranial anatomy of the Ziyang 1 human skull
    WU Xiujie, YAN Yi
    Acta Anthropologica Sinica    2020, 39 (04): 511-520.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0024
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    Although the specific location is not clear and its dating is still debated, the Ziyang human fossil has attracted extensive attention from academic circles because it is the first almost complete human skull fossil found after the establishment of the People’s Republic of China. For a long time, the research on the Ziyang skull was limited to only external morphology and measurements using traditional methods. In order to better understand the evolutionary stage of the Ziyang hominid, a high-resolution industrial CT scanner was used to analyze its internal anatomy, and 3D virtual reconstructions of its bone structure, frontal sinus, bony labyrinth, pneumatization of mastoid air cells, and endocast were created and analyzed. CT images of the bone structure shows that the diploë is very thick—much thicker than the outer and inner layers. This supports the previous identification results of the Ziyang individual over 50 years old. The frontal sinus of the Ziyang is in the shape of a leaf, bilaterally located on the inner and upper orbital areas, with surface areas on the left and right of 1780 mm2and 2910mm2, respectively. The size and proportion of the Ziyang semicircular canals of the bony labyrinth are different from Neandertals, but are in the ranges of those from Late Pleistocene Homo sapiens and recent modern humans. The pneumatization of mastoid cells was in pneumatic type, and almost occupied the entire mastoid process with pneumatic cavities. Based on the 3D virtual reconstruction of the endocast, the cranial capacity of the Ziyang skull was estimated at around 1250 mL. Although the endocast is small in all measurements, most of the brain morphology as well as the width-height index and the parietal lobe-length index were all within the variation range of modern humans, which are different from those of Homo erectus and Pleistocene archaic humans. The internal anatomy of the Ziyang skull retains a few original features, including the two occipital lobes that are prominently backwardly convex, and the cerebral fossa, which is larger and deeper than the cerebellar fossa. These two features are different from Holocene humans but are similar to Pleistocene early modern humans.

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    Enamel-dentine junction shape and enamel thickness distribution of East Asian Middle Pleistocene hominin lower second molars
    XING Song, ZHOU Mi, PAN Lei
    Acta Anthropologica Sinica    2020, 39 (04): 521-531.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0019
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    Morphological diversity has been revealed in the cranial, mandibular, and dental materials of East Asian Middle Pleistocene hominins, and the taxonomy of later members is uncertain. In order to further apprehend the morphological variability of East Asian Middle Pleistocene hominins and provide evidence for the taxonomy of the later members, the present study conducted three-dimensional morphometric analyses, including morphometric map of lateral enamel thickness and diffeomorphic surface matching of enamel-dentine junction (EDJ), on the lower second molars. The results indicate that: 1) East Asian Middle Pleistocene hominins could be distinguished from both Neanderthals and modern human; 2) East Asian late Middle Pleistocene hominins displayed special distribution pattern of lateral enamel thickness and a more progressive EDJ shape relative to mid-Middle Pleistocene Homo erectus. The present study quantifies two important morphologies and their variability, i.e., distribution pattern of enamel thickness and EDJ shape, in addition to the individual dental traits studied by previous works. It will provide further insight into the taxonomies of East Asian late Middle Pleistocene hominins and help designating isolated teeth from the same period into their correct morphological groups.

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    Analysis of dental caries in the Yangshao population at the Qingtai site, Zhengzhou city
    YUAN Haibing, GU Wanfa, WEI Qingli, WU Qian, DING Lanpo, CAO Doudou
    Acta Anthropologica Sinica    2022, 41 (02): 226-237.   DOI: 10.16359/j.1000-3193/AAS.2021.0023
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    This paper focuses on the prevalence of dental caries in the Neolithic Yangshao population from the Qingtai site, Zhengzhou city, Henan Province. A total of 1913 teeth and 91 individuals were included in this study. The individual caries rate of Qingtai group is 71.43%, and the caries rate of teeth is 13.38% which rises to 17.03% after correction. Females had a higher caries rate than males, which may be attributed to the physiological changes during pregnancy, food preference and labor division between different sex groups. The caries rate of maxilla is higher than that of mandible; besides, molars and occlusal surfaces were more prone to dental caries than other teeth and locations. Compared with other Neolithic populations in China, Qingtai people presented a relatively higher caries rate. This phenomenon suggests that their diet may contain a large amount of carbohydrates, which can also be associated with the developed millet farming in this region during the Yangshao culture period. In addition, the regional differences of dental caries rate among the Neolithic agricultural populations in the middle and lower reaches of the Yellow River and the Yangtze River may be related to the complexity of the caries etiology and the differences of cultural features as well as lifestyles.

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    Bone artifacts of the Honghe site in Qiqihar, Heilongjiang
    LIANG Qiyao, ZHANG Wei, CHEN Quanjia, TIAN He
    Acta Anthropologica Sinica    2021, 40 (05): 751-763.   DOI: 10.16359/j.cnki.cn11-1963/q.2020.0025
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    The study on bone tools, as an important topic of zooarchaeological research, has gradually become basis for the study of prehistoric Nenjiang River Basin subsistence model since Liang Siyong discovered the bone tools of the Ang’angxi site in the 1930s. In the archaeological excavations of the Honghe site in 2013, 2014, 2015 and 2017, a significant number of artifacts dating back to the Neolithic Age and Bronze Age were recovered. A total of 343 well-preserved bone tools (including tools made of bone and antler) were collected. According to the analysis of these artifacts, the manufacturing process and retouching technology of them in two different periods were discovered, which may shed new light on economic model of prehistory residents, regional characteristics and other related issues.

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