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Yi Z, Zanolli C, Liao W, Liang H, Yao Y, Tian C, Wang K, Xu G, Wang W. Enamel thickness in the deciduous postcanine dentition of fossil and extant Pongo. J Hum Evol 2024; 191:103493. [PMID: 38714076 DOI: 10.1016/j.jhevol.2024.103493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 01/01/2024] [Accepted: 01/02/2024] [Indexed: 05/09/2024]
Affiliation(s)
- Zhixing Yi
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China; Guangxi Academy of Sciences, Nanning, 530007, China
| | - Clément Zanolli
- Univ. Bordeaux, CNRS, MCC, PACEA, UMR 5199, F-33600, Pessac, France
| | - Wei Liao
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China
| | - Hua Liang
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China
| | - Yanyan Yao
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China; Anthropology Museum of Guangxi, Nanning, 530012, China
| | - Chun Tian
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China
| | - Kun Wang
- School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, 221116, China
| | - Guilin Xu
- Guangxi Academy of Sciences, Nanning, 530007, China; Key Laboratory of Beibu Gulf Environment Change and Resources Utilization of Ministry of Education, Nanning Normal University, Nanning, 530001, China.
| | - Wei Wang
- Institute of Cultural Heritage, Shandong University, Qingdao, 266237, China.
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2
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Pop E, Noerwidi S, Spoor F. Naming Homo erectus: A review. J Hum Evol 2024; 190:103516. [PMID: 38547747 DOI: 10.1016/j.jhevol.2024.103516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/20/2024] [Accepted: 02/20/2024] [Indexed: 04/20/2024]
Abstract
Following the discovery of hominin fossils at Trinil (Java, Indonesia) in 1891 and 1892, Eugène Dubois named a new species, now known as Homo erectus. Although the main historical events are well-known, there appears to be no consensus regarding two important aspects of the naming of the species, including what constitutes the original publication of the name, and what is the name-bearing type specimen. These issues are addressed in this paper with reference to original sources and the International Code of Zoological Nomenclature. Our review confirms earlier studies that cite the published quarterly fieldwork report covering the 3rd quarter of 1892 as the original publication naming the species erectus. However, until recently, the correct publication year of 1893 has consistently been cited as 1892, and it has rarely been recognized that the author of the publication was anonymous, even though the author of the species is specifically named. Importantly, Dubois assigns all three hominin fossils found at Trinil up to that moment to the new species, explicitly stating that they belong to a single individual. The three fossils, a molar, a calotte, and a femur, therefore jointly constitute the original holotype. However, the femur most likely derives from younger strata than the other hominins and shows fully modern human-like morphology, unlike subsequently discovered H. erectus femora. Moreover, there is no consensus over the affinities of the molar, and if it is H. erectus rather than an extinct ape, there is no evidence that it belongs to the same individual as the calotte. Excluding these two fossils from the holotype, the calotte is the appropriate fossil to retain the role as name-bearing specimen.
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Affiliation(s)
- Eduard Pop
- Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA, Leiden, the Netherlands; Faculty of Archaeology, Leiden University, P.O. Box 9514, 2300 RA, Leiden, the Netherlands.
| | - Sofwan Noerwidi
- Research Center for Archaeometry, National Research and Innovation Agency, Jl. Condet Pejaten 4, Pasar Minggu, Jakarta Selatan 12510, Indonesia
| | - Fred Spoor
- Centre for Human Evolution Research, Natural History Museum, Cromwell Road, SW7 5BD London, United Kingdom; Department of Human Origins, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
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3
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Smith TM, Arora M, Austin C, Nunes Ávila J, Duval M, Lim TT, Piper PJ, Vaiglova P, de Vos J, Williams IS, Zhao JX, Green DR. Oxygen isotopes in orangutan teeth reveal recent and ancient climate variation. eLife 2024; 12:RP90217. [PMID: 38457350 PMCID: PMC10942278 DOI: 10.7554/elife.90217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2024] Open
Abstract
Studies of climate variation commonly rely on chemical and isotopic changes recorded in sequentially produced growth layers, such as in corals, shells, and tree rings, as well as in accretionary deposits-ice and sediment cores, and speleothems. Oxygen isotopic compositions (δ18O) of tooth enamel are a direct method of reconstructing environmental variation experienced by an individual animal. Here, we utilize long-forming orangutan dentitions (Pongo spp.) to probe recent and ancient rainfall trends on a weekly basis over ~3-11 years per individual. We first demonstrate the lack of any consistent isotopic enrichment effect during exclusive nursing, supporting the use of primate first molar teeth as environmental proxies. Comparisons of δ18O values (n=2016) in twelve molars from six modern Bornean and Sumatran orangutans reveal a high degree of overlap, with more consistent annual and bimodal rainfall patterns in the Sumatran individuals. Comparisons with fossil orangutan δ18O values (n=955 measurements from six molars) reveal similarities between modern and late Pleistocene fossil Sumatran individuals, but differences between modern and late Pleistocene/early Holocene Bornean orangutans. These suggest drier and more open environments with reduced monsoon intensity during this earlier period in northern Borneo, consistent with other Niah Caves studies and long-term speleothem δ18O records in the broader region. This approach can be extended to test hypotheses about the paleoenvironments that early humans encountered in southeast Asia.
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Affiliation(s)
- Tanya M Smith
- Griffith Centre for Social and Cultural Research, Griffith UniversitySouthportAustralia
- Australian Research Centre for Human Evolution, Griffith UniversitySouthportAustralia
| | - Manish Arora
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount SinaiNew YorkUnited States
| | - Christine Austin
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount SinaiNew YorkUnited States
| | - Janaína Nunes Ávila
- Griffith Centre for Social and Cultural Research, Griffith UniversitySouthportAustralia
- School of the Environment, The University of QueenslandBrisbaneAustralia
| | - Mathieu Duval
- Australian Research Centre for Human Evolution, Griffith UniversitySouthportAustralia
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH)BurgosSpain
- Palaeoscience Labs, Department of Archaeology and History, La Trobe UniversityMelbourneAustralia
| | - Tze Tshen Lim
- Department of Geology, Universiti MalayaKuala LumpurMalaysia
| | - Philip J Piper
- School of Archaeology and Anthropology, The Australian National UniversityCanberraAustralia
| | - Petra Vaiglova
- Griffith Centre for Social and Cultural Research, Griffith UniversitySouthportAustralia
- Australian Research Centre for Human Evolution, Griffith UniversitySouthportAustralia
- School of Archaeology and Anthropology, The Australian National UniversityCanberraAustralia
| | - John de Vos
- Department of Geology, Naturalis Biodiversity CenterLeidenNetherlands
| | - Ian S Williams
- Research School of Earth Sciences, The Australian National UniversityCanberraAustralia
| | - Jian-xin Zhao
- Radiogenic Isotope Facility, School of the Environment, The University of QueenslandBrisbaneAustralia
| | - Daniel R Green
- Australian Research Centre for Human Evolution, Griffith UniversitySouthportAustralia
- Department of Human Evolutionary Biology, Harvard UniversityCambridgeUnited States
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4
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Kubat J, Paterson R, Patramanis I, Barker G, Demeter F, Filoux A, Kullmer O, Mackie M, Marques-Bonet T, Huong NTM, Tuan NA, Pheng S, Rippengal J, Schrenk F, Souksavatdy V, Tshen LT, Wattanapituksakul A, Wang W, Zanolli C, Cappellini E, Bacon AM. Geometric morphometrics and paleoproteomics enlighten the paleodiversity of Pongo. PLoS One 2023; 18:e0291308. [PMID: 38100471 PMCID: PMC10723683 DOI: 10.1371/journal.pone.0291308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 08/27/2023] [Indexed: 12/17/2023] Open
Abstract
Pleistocene Pongo teeth show substantial variation in size and morphology, fueling taxonomic debates about the paleodiversity of the genus. We investigated prominent features of the enamel-dentine-junction junction (EDJ)-phylogenetically informative internal structures-of 71 fossil Pongo lower molars from various sites by applying geometric morphometrics and conducted paleoproteomic analyses from enamel proteins to attempt to identify extinct orangutan species. Forty-three orangutan lower molars representing Pongo pygmaeus and Pongo abelii were included for comparison. The shape of the EDJ was analyzed by placing five landmarks on the tip of the main dentine horns, and 142 semilandmarks along the marginal ridges connecting the dentine horns. Paleoproteomic analyses were conducted on 15 teeth of Late Pleistocene Pongo using high-resolution tandem mass spectrometry. The geometric morphometric results show variations in EDJ shape regarding aspects of the height and position of the dentine horns and connecting ridges. Despite the issue of molar position and sample size, modern molars are distinguished from fossil counterparts by their elongated tooth outline and narrowly positioned dentine horns. Proteomic results show that neither a distinction of P. pygmaeus and P. abelii, nor a consistent allocation of fossil specimens to extant species is feasible. Based on the EDJ shape, the (late) Middle to Late Pleistocene Pongo samples from Vietnam share the same morphospace, supporting the previous allocation to P. devosi, although substantial overlap with Chinese fossils could also indicate close affinities with P. weidenreichi. The hypothesis that both species represent one chronospecies cannot be ruled out. Two fossil specimens, one from Tam Hay Marklot (Laos, Late Pleistocene), and another from Sangiran (Java, Early to Middle Pleistocene), along with some specimens within the Punung sample (Java), exhibit affinities with Pongo abelii. The Punung fossils might represent a mix of early Late Pleistocene and later specimens (terminal Pleistocene to Holocene) related to modern Pongo. The taxonomy and phylogeny of the complete Punung sample needs to be further investigated.
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Affiliation(s)
- Jülide Kubat
- CNRS, BABEL, Université Paris Cité, Paris, France
- Department of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Ryan Paterson
- Globe Institute, University of Copenhagen, Copenhagen, Denmark
| | | | - Graeme Barker
- McDonald Institute for Archaeological Research, University of Cambridge, Cambridge, United Kingdom
| | - Fabrice Demeter
- Lundbeck Foundation GeoGenetics Centre, Globe Institute, University of Copenhagen, Copenhagen, Denmark
- UMR 7206 Eco Anthropologie, Muséum National d’Histoire Naturelle, CNRS, Paris, France
| | - Arnaud Filoux
- Palaeontological Research and Education Centre, Mahasarakham University, Mahasarakham, Thailand
| | - Ottmar Kullmer
- Department of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Meaghan Mackie
- Globe Institute, University of Copenhagen, Copenhagen, Denmark
- The Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark
| | - Tomas Marques-Bonet
- Institute of Evolutionary Biology (UPF-CSIC), PRBB, Barcelona, Spain
- Catalan Institution of Research and Advanced Studies (ICREA), Passeig de Lluís Companys, Barcelona, Spain
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Nguyen Thi Mai Huong
- Anthropological and Palaeoenvironmental Department, Institute of Archaeology, Ha Noi, Vietnam
| | - Nguyen Anh Tuan
- Anthropological and Palaeoenvironmental Department, Institute of Archaeology, Ha Noi, Vietnam
| | - Sytha Pheng
- Royal University of Fine Arts, Phnom Penh, Cambodia
| | - Jessica Rippengal
- McDonald Institute for Archaeological Research, University of Cambridge, Cambridge, United Kingdom
| | - Friedemann Schrenk
- Department of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Viengkeo Souksavatdy
- Department of Heritage, Ministry of Information, Culture and Tourism, Vientiane, Lao People’s Democratic Republic
| | - Lim Tze Tshen
- Department of Geology, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | | | - Wei Wang
- Institute of Cultural Heritage, Shandong University, Qingdao, China
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Gaboutchian AV, Knyaz VA, Maschenko EN, Dac LX, Maksimov AA, Emelyanov AV, Korost DV, Stepanov NV. Measuring Dental Enamel Thickness: Morphological and Functional Relevance of Topographic Mapping. J Imaging 2023; 9:127. [PMID: 37504804 PMCID: PMC10381522 DOI: 10.3390/jimaging9070127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 05/10/2023] [Accepted: 06/01/2023] [Indexed: 07/29/2023] Open
Abstract
The interest in the development of dental enamel thickness measurement techniques is connected to the importance of metric data in taxonomic assessments and evolutionary research as well as in other directions of dental studies. At the same time, advances in non-destructive imaging techniques and the application of scanning methods, such as micro-focus-computed X-ray tomography, has enabled researchers to study the internal morpho-histological layers of teeth with a greater degree of accuracy and detail. These tendencies have contributed to changes in established views in different areas of dental research, ranging from the interpretation of morphology to metric assessments. In fact, a significant amount of data have been obtained using traditional metric techniques, which now should be critically reassessed using current technologies and methodologies. Hence, we propose new approaches for measuring dental enamel thickness using palaeontological material from the territories of northern Vietnam by means of automated and manually operated techniques. We also discuss method improvements, taking into account their relevance for dental morphology and occlusion. As we have shown, our approaches demonstrate the potential to form closer links between the metric data and dental morphology and provide the possibility for objective and replicable studies on dental enamel thickness through the application of automated techniques. These features are likely to be effective in more profound taxonomic research and for the development of metric and analytical systems. Our technique provides scope for its targeted application in clinical methods, which could help to reveal functional changes in the masticatory system. However, this will likely require improvements in clinically applicable imaging techniques.
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Affiliation(s)
- Armen V Gaboutchian
- Medical Institute, Peoples' Friendship University (RUDN), 117198 Moscow, Russia
| | - Vladimir A Knyaz
- Phystech School of Applied Mathematics and Informatics, Moscow Institute of Physics and Technology (MIPT), 141701 Dolgoprudny, Russia
- State Research Institute of Aviation Systems (GosNIIAS), 125319 Moscow, Russia
| | - Evgeniy N Maschenko
- Borissiak Paleontological Institute, Russian Academy of Sciences, 117647 Moscow, Russia
| | - Le Xuan Dac
- Joint Russian-Vietnamese Tropical Scientific and Technological Center, Hanoi 650000, Vietnam
- Institute of Tropical Ecology of the Joint Russian-Vietnamese Tropical Scientific and Technological Center, Hanoi 650000, Vietnam
| | - Anatoly A Maksimov
- State Research Institute of Aviation Systems (GosNIIAS), 125319 Moscow, Russia
| | - Anton V Emelyanov
- State Research Institute of Aviation Systems (GosNIIAS), 125319 Moscow, Russia
| | - Dmitry V Korost
- Faculty of Geology, Moscow State University, 119991 Moscow, Russia
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6
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Imai T, Hattori S, Uesugi K, Hoshino M. High-energy synchrotron-radiation-based X-ray micro-tomography enables non-destructive and micro-scale palaeohistological assessment of macro-scale fossil dinosaur bones. JOURNAL OF SYNCHROTRON RADIATION 2023; 30:627-633. [PMID: 37026390 PMCID: PMC10161879 DOI: 10.1107/s1600577523001790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 02/27/2023] [Indexed: 05/06/2023]
Abstract
Palaeohistological analysis has numerous applications in understanding the palaeobiology of extinct dinosaurs. Recent developments of synchrotron-radiation-based X-ray micro-tomography (SXMT) have allowed the non-destructive assessment of palaeohistological features in fossil skeletons. Yet, the application of the technique has been limited to specimens on the millimetre to micrometre scale because its high-resolution capacity has been obtained at the expense of a small field of view and low X-ray energy. Here, SXMT analyses of dinosaur bones with widths measuring ∼3 cm under a voxel size of ∼4 µm at beamline BL28B2 at SPring-8 (Hyogo, Japan) are reported, and the advantages of virtual-palaeohistological analyses with large field of view and high X-ray energy are explored. The analyses provide virtual thin-sections visualizing palaeohistological features comparable with those obtained by traditional palaeohistology. Namely, vascular canals, secondary osteons and lines of arrested growth are visible in the tomography images, while osteocyte lacunae are unobservable due to their micrometre-scale diameter. Virtual palaeohistology at BL28B2 is advantageous in being non-destructive, allowing multiple sampling within and across skeletal elements to exhaustively test the skeletal maturity of an animal. Continued SXMT experiments at SPring-8 should facilitate the development of SXMT experimental procedures and aid in understanding the paleobiology of extinct dinosaurs.
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Affiliation(s)
- Takuya Imai
- Institute of Dinosaur Research, Fukui Prefectural University, 4-1-1 Matsuoka Kenjojima, Eiheiji, Fukui 910-1195, Japan
| | - Soki Hattori
- Institute of Dinosaur Research, Fukui Prefectural University, 4-1-1 Matsuoka Kenjojima, Eiheiji, Fukui 910-1195, Japan
| | - Kentaro Uesugi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Masato Hoshino
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
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7
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Besnard C, Marie A, Sasidharan S, Harper RA, Shelton RM, Landini G, Korsunsky AM. Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review. Dent J (Basel) 2023; 11:98. [PMID: 37185477 PMCID: PMC10137518 DOI: 10.3390/dj11040098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/19/2023] [Accepted: 03/28/2023] [Indexed: 05/17/2023] Open
Abstract
Hard dental tissues possess a complex hierarchical structure that is particularly evident in enamel, the most mineralised substance in the human body. Its complex and interlinked organisation at the Ångstrom (crystal lattice), nano-, micro-, and macro-scales is the result of evolutionary optimisation for mechanical and functional performance: hardness and stiffness, fracture toughness, thermal, and chemical resistance. Understanding the physical-chemical-structural relationships at each scale requires the application of appropriately sensitive and resolving probes. Synchrotron X-ray techniques offer the possibility to progress significantly beyond the capabilities of conventional laboratory instruments, i.e., X-ray diffractometers, and electron and atomic force microscopes. The last few decades have witnessed the accumulation of results obtained from X-ray scattering (diffraction), spectroscopy (including polarisation analysis), and imaging (including ptychography and tomography). The current article presents a multi-disciplinary review of nearly 40 years of discoveries and advancements, primarily pertaining to the study of enamel and its demineralisation (caries), but also linked to the investigations of other mineralised tissues such as dentine, bone, etc. The modelling approaches informed by these observations are also overviewed. The strategic aim of the present review was to identify and evaluate prospective avenues for analysing dental tissues and developing treatments and prophylaxis for improved dental health.
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Affiliation(s)
- Cyril Besnard
- MBLEM, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, Oxfordshire, UK
| | - Ali Marie
- MBLEM, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, Oxfordshire, UK
| | - Sisini Sasidharan
- MBLEM, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, Oxfordshire, UK
| | - Robert A. Harper
- School of Dentistry, University of Birmingham, 5 Mill Pool Way, Edgbaston, Birmingham B5 7EG, West Midlands, UK
| | - Richard M. Shelton
- School of Dentistry, University of Birmingham, 5 Mill Pool Way, Edgbaston, Birmingham B5 7EG, West Midlands, UK
| | - Gabriel Landini
- School of Dentistry, University of Birmingham, 5 Mill Pool Way, Edgbaston, Birmingham B5 7EG, West Midlands, UK
| | - Alexander M. Korsunsky
- MBLEM, Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, Oxfordshire, UK
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8
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Dietary strategies of Pleistocene Pongo sp. and Homo erectus on Java (Indonesia). Nat Ecol Evol 2023; 7:279-289. [PMID: 36646949 DOI: 10.1038/s41559-022-01947-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 11/09/2022] [Indexed: 01/18/2023]
Abstract
During the Early to Middle Pleistocene, Java was inhabited by hominid taxa of great diversity. However, their seasonal dietary strategies have never been explored. We undertook geochemical analyses of orangutan (Pongo sp.), Homo erectus and other mammalian Pleistocene teeth from Sangiran. We reconstructed past dietary strategies at subweekly resolution and inferred seasonal ecological patterns. Histologically controlled spatially resolved elemental analyses by laser-based plasma mass spectrometry confirmed the preservation of authentic biogenic signals despite the effect of spatially restricted diagenetic overprint. The Sr/Ca record of faunal remains is in line with expected trophic positions, contextualizing fossil hominid diet. Pongo sp. displays marked seasonal cycles with ~3 month-long strongly elevated Sr/Ca peaks, reflecting contrasting plant food consumption presumably during the monsoon season, while lower Sr/Ca ratios suggest different food availability during the dry season. In contrast, omnivorous H. erectus shows low and less accentuated intra-annual Sr/Ca variability compared to Pongo sp., with δ13C data of one individual indicating a dietary shift from C4 to a mix of C3 and C4 plants. Our data suggest that H. erectus on Java was maximizing the resources available in more open mosaic habitats and was less dependent on variations in seasonal resource availability. While still influenced by seasonal food availability, we infer that H. erectus was affected to a lesser degree than Pongo sp., which inhabited monsoonal rain forests on Java. We suggest that H. erectus maintained a greater degree of nutritional independence by exploiting the regional diversity of food resources across the seasons.
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9
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Power RC, Henry AG, Moosmann J, Beckmann F, Temming H, Roberts A, Le Cabec A. Synchrotron radiation-based phase-contrast microtomography of human dental calculus allows nondestructive analysis of inclusions: implications for archeological samples. J Med Imaging (Bellingham) 2022; 9:031505. [PMID: 35310450 PMCID: PMC8924454 DOI: 10.1117/1.jmi.9.3.031505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 02/21/2022] [Indexed: 11/14/2022] Open
Abstract
Purpose: Dental calculus forms on teeth during the life of an individual and its investigation can yield information about diet, health status, and environmental pollution. Currently, the analytical techniques used to visualize the internal structure of human dental calculus and entrapped inclusions are limited and require destructive sampling, which cannot always be justified. Approach: We used propagation phase-contrast synchrotron radiation micro-computed tomography (PPC-SR- μ CT ) to non-destructively examine the internal organization of dental calculus, including its microstructure and entrapped inclusions, on both modern and archeological samples. Results: The virtual histological exploration of the samples shows that PPC-SR- μ CT is a powerful approach to visualize the internal organization of dental calculus. We identified several important features, including previously undetected negative imprints of enamel and dentine growth markers (perikymata and periradicular bands, respectively), the non-contiguous structure of calculus layers with multiple voids, and entrapped plant remains. Conclusions: PPC-SR- μ CT is an effective technique to explore dental calculus structural organization, and is especially powerful for enabling the identification of inclusions. The non-destructive nature of synchrotron tomography helps protect samples for future research. However, the irregular layers and frequent voids reveal a high heterogeneity and variability within calculus, with implications for research focusing on inclusions.
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Affiliation(s)
- Robert C Power
- Ludwig-Maximilians-University Munich, Institute for Pre- and Protohistoric Archaeology and Archaeology of the Roman Provinces, Munich, Germany.,Max Planck Institute for Evolutionary Anthropology, Department of Human Evolution, Leipzig, Germany
| | - Amanda G Henry
- Leiden University, Faculty of Archaeology, Leiden, The Netherlands
| | | | | | - Heiko Temming
- Max Planck Institute for Evolutionary Anthropology, Department of Human Evolution, Leipzig, Germany
| | - Anthony Roberts
- Cork University Dental School and Hospital, University College Cork, Ireland
| | - Adeline Le Cabec
- Max Planck Institute for Evolutionary Anthropology, Department of Human Evolution, Leipzig, Germany.,Univ. Bordeaux, CNRS, MCC, PACEA, UMR 5199, Pessac, France
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10
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Urciuoli A, Kubat J, Schisanowski L, Schrenk F, Zipfel B, Tawane M, Bam L, Alba DM, Kullmer O. Cochlear morphology of Indonesian Homo erectus from Sangiran. J Hum Evol 2022; 165:103163. [PMID: 35299091 DOI: 10.1016/j.jhevol.2022.103163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 01/31/2022] [Accepted: 01/31/2022] [Indexed: 10/18/2022]
Abstract
Homo erectus s.l. is key for deciphering the origin and subsequent evolution of genus Homo. However, the characterization of this species is hindered by the existence of multiple variants in both mainland and insular Asia, as a result of divergent chronogeographical evolutionary trends, genetic isolation, and interbreeding with other human species. Previous research has shown that cochlear morphology embeds taxonomic and phylogenetic information that may help infer the phylogenetic relationships among hominin species. Here we describe the cochlear morphology of two Indonesian H. erectus individuals (Sangiran 2 and 4), and compare it with a sample of australopiths, Middle to Late Pleistocene humans, and extant humans by means of linear measurements and both principal components and canonical variates analyses performed on shape ratios. Our results indicate that H. erectus displays a mosaic morphology that combines plesiomorphic (australopithlike) features (such as a chimplike round cochlear cross section and low cochlear thickness), with derived characters of later humans (a voluminous and long cochlea, possibly related to hearing abilities)-consistent with the more basal position of H. erectus. Our results also denote substantial variation between the two studied individuals, particularly in the length and radius of the first turn, as well as cross-sectional shape. Given the small size of the available sample, it is not possible to discern whether such differences merely reflect intraspecific variation among roughly coeval H. erectus individuals or whether they might result from greater age differences between them than currently considered. However, our results demonstrate that most characters found in later humans were already present in Indonesian H. erectus, with the exception of Neanderthals, which display an autapomorphic condition relative to other Homo species.
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Affiliation(s)
- Alessandro Urciuoli
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, Cerdanyola del Vallès, Barcelona, 08193, Spain.
| | - Jülide Kubat
- CNRS UMR 8045 Babel, Université de Paris, Faculté de chirurgie dentaire, 1 rue Maurice Arnoux, Montrouge, 92120, France; Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Lisa Schisanowski
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Friedemann Schrenk
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany; Department of Paleobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Bernhard Zipfel
- Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
| | - Mirriam Tawane
- Ditsong National Museum of Natural History, Pretoria, South Africa
| | - Lunga Bam
- Department of Radiation Science, South African Nuclear Energy Corporation (Necsa), Pretoria 0001, South Africa
| | - David M Alba
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/Columnes s/n, Campus de la UAB, Cerdanyola del Vallès, Barcelona, 08193, Spain
| | - Ottmar Kullmer
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany; Department of Paleobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University Frankfurt, Frankfurt am Main, Germany
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11
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Distinguishing primate taxa with enamel incremental variables. J Hum Evol 2022; 164:103139. [PMID: 35123173 DOI: 10.1016/j.jhevol.2021.103139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 12/23/2021] [Accepted: 12/23/2021] [Indexed: 11/23/2022]
Abstract
Enamel has long been of interest for its functional and phylogenetic significance among fossil hominins and other primates. Previous studies demonstrated that enamel incremental features distinguish among hominin fossil taxa, suggesting utility for highlighting taxonomy. However, not all features appear to be useful in mixed samples of fossils, living humans, and apes. Here we tested enamel incremental data from closely related primate taxa to determine which features, if any, distinguish among them. Enamel incremental variables were measured from the M2 of 40 living primate taxa, and we tested our variables using discriminant function analysis at the taxonomic ranks of parvorder, family, tribe, and genus. We then included enamel incremental data from Australopithecus afarensis, Australopithecus africanus, Paranthropus aethiopicus, Paranthropus boisei, and Paranthropus robustus to determine if these features distinguished fossil taxa from living humans and apes. Our initial results show that enamel incremental variables distinguish among primate taxa, but with low classification rates. Further testing with jackknifing methods shows overlap between groups at all taxonomic ranks, suggesting enamel incremental variables are unreliable for taxonomy. The addition of many common enamel incremental growth variables also resulted in multicollinearity in our multivariate analysis. As the dentition and isolated teeth remain a significant portion of the hominin fossil record, verifying enamel incremental features as a useful taxonomic tool is fundamentally important for hominin paleobiology.
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12
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Zanolli C, Kaifu Y, Pan L, Xing S, Mijares AS, Kullmer O, Schrenk F, Corny J, Dizon E, Robles E, Détroit F. Further analyses of the structural organization of Homo luzonensis teeth: Evolutionary implications. J Hum Evol 2022; 163:103124. [PMID: 34998272 DOI: 10.1016/j.jhevol.2021.103124] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 11/22/2021] [Accepted: 11/22/2021] [Indexed: 01/13/2023]
Abstract
The species Homo luzonensis has recently been described based on a set of dental and postcranial elements found at Callao Cave (Northern Luzon, Philippines) and dated to at least 50-67 ka. Seven postcanine maxillary teeth are attributed to this taxon, five of them belonging to the same individual (CCH6) and representing the holotype of H. luzonensis, whereas the isolated upper premolar CCH8 and the upper third molar CCH9 are paratypes of the species. The teeth are characterized by their small dimensions associated with primitive features, as also found in Homo floresiensis, another hominin having evolved in an insular environment of Southeast Asia. Postcranial bones of the hands and feet of H. luzonensis and H. floresiensis show Homo habilis-like or australopith-like features, whereas cranial and dental morphology are more consistent with the Asian Homo erectus morphology. Due to this mosaic morphology, the origin and phylogenetic relationships of both H. luzonensis and H. floresiensis are still debated. To test the hypotheses that H. luzonensis derives from H. erectus or from an earlier small-brained hominin, we analyzed the µCT scans of the teeth. We investigated both external and internal tooth structure using morphometric methods including: crown outline shape, tooth crown tissue proportions, enamel-dentine junction shape, and pulp morphology. Homo luzonensis external crown morphology aligns more with H. erectus than with H. habilis/H. rudolfensis. The internal structural organization of H. luzonensis teeth exhibits more affinities with that of H. erectus and H. floresiensis than with Neanderthals and modern humans. Our results suggest that both H. floresiensis and H. luzonensis likely evolved from some H. erectus groups that dispersed in the various islands of this region and became isolated until endemic speciation events occurred at least twice during the Pleistocene in insular environments.
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Affiliation(s)
- Clément Zanolli
- Univ. Bordeaux, CNRS, MCC, PACEA, UMR 5199, F-33600 Pessac, France.
| | - Yousuke Kaifu
- The University Museum, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Lei Pan
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China; CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China
| | - Song Xing
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China; CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China
| | - Armand S Mijares
- Archaeological Studies Program, University of the Philippines, Quezon City 1101, Philippines; National Museum of the Philippines, Manila 1000, Philippines
| | - Ottmar Kullmer
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany; Department of Palaeobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University Frankfurt, Frankfurt, Germany
| | - Friedemann Schrenk
- Division of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany; Department of Palaeobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University Frankfurt, Frankfurt, Germany
| | - Julien Corny
- UMR 7194, CNRS, Département Homme & Environnement, Muséum National D'Histoire Naturelle, Musée de L'Homme, 75016 Paris, France
| | - Eusebio Dizon
- National Museum of the Philippines, Manila 1000, Philippines
| | - Emil Robles
- Archaeological Studies Program, University of the Philippines, Quezon City 1101, Philippines
| | - Florent Détroit
- UMR 7194, CNRS, Département Homme & Environnement, Muséum National D'Histoire Naturelle, Musée de L'Homme, 75016 Paris, France.
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13
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New Approach to Dental Morphometric Research Based on 3D Imaging Techniques. J Imaging 2021; 7:jimaging7090184. [PMID: 34564110 PMCID: PMC8469472 DOI: 10.3390/jimaging7090184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 11/17/2022] Open
Abstract
Recent progress in imaging and image processing techniques has provided for improvements in odontological research in a variety of aspects. Thus, the presented method has been developed precisely in order to assess metrically 3D reconstructions of teeth. Rapidly and accurately obtained data of a wide range and appropriate density are sufficient enough for morphometric studies rather than tooth size assessments which are inherent to conventional techniques. The main contributions providing for holistic and objective morphometric analysis of teeth are the following: (1) interpretation of basic dental morphological features; (2) automated of orientational coordinate system setup based on tooth surface analysis; (3) new tooth morphometric parameters which could not be obtained through application of conventional odontometric techniques; (4) methodological novelty for automated odontomorphometric analysis pipeline. Application of tomographic imaging, which has been used for obtaining 3D models, expands the proposed method potential further through providing detailed and comprehensive reconstructions of teeth. The current study was conducted on unique material from the archaeological site of Sunghir related to the Upper Palaeolithic period. Metric assessments of external and internal morphological layers of teeth were performed in common orientation and sectioning. The proposed technique allowed more profound analysis of Sunghirian teeth which date back to the times of modern human morphology formation.
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14
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Davies TW, Alemseged Z, Gidna A, Hublin JJ, Kimbel WH, Kullmer O, Spoor F, Zanolli C, Skinner MM. Accessory cusp expression at the enamel-dentine junction of hominin mandibular molars. PeerJ 2021; 9:e11415. [PMID: 34055484 PMCID: PMC8141287 DOI: 10.7717/peerj.11415] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 04/16/2021] [Indexed: 11/20/2022] Open
Abstract
Studies of hominin dental morphology frequently consider accessory cusps on the lower molars, in particular those on the distal margin of the tooth (C6 or distal accessory cusp) and the lingual margin of the tooth (C7 or lingual accessory cusp). They are often utilized in studies of hominin systematics, where their presence or absence is assessed at the outer enamel surface (OES). However, studies of the enamel-dentine junction (EDJ) suggest these traits may be more variable in development, morphology and position than previously thought. Building on these studies, we outline a scoring procedure for the EDJ expression of these accessory cusps that considers the relationship between these accessory cusps and the surrounding primary cusps. We apply this scoring system to a sample of Plio-Pleistocene hominin mandibular molars of Paranthropus robustus, Paranthropus boisei, Australopithecus afarensis, Australopithecus africanus, Homo sp., Homo habilis and Homo erectus from Africa and Asia (n = 132). We find that there are taxon-specific patterns in accessory cusp expression at the EDJ that are consistent with previous findings at the OES. For example, P. robustus M1s and M2s very often have a distal accessory cusp but no lingual accessory cusp, while H. habilis M1s and M2s show the opposite pattern. The EDJ also reveals a number of complicating factors; some apparent accessory cusps at the enamel surface are represented at the EDJ only by shouldering on the ridges associated with the main cusps, while other accessory cusps appear to have little or no EDJ expression at all. We also discuss the presence of double and triple accessory cusps, including the presence of a double lingual accessory cusp on the distal ridge of the metaconid in the type specimen of H. habilis (OH 7–M1) that is not clear at the OES due to occlusal wear. Overall, our observations, as well as our understanding of the developmental underpinnings of cusp patterning, suggest that we should be cautious in our comparisons of accessory cusps for taxonomic interpretations.
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Affiliation(s)
- Thomas W Davies
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Zeresenay Alemseged
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, United States
| | - Agness Gidna
- Paleontology Unit, National Museum of Tanzania, Dar es Salaam, Tanzania
| | - Jean-Jacques Hublin
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Collège de France, Paris, France
| | - William H Kimbel
- Institute of Human Origins, and School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona, United States
| | - Ottmar Kullmer
- Department of Paleobiology and Environment, Institute of Ecology, Evolution, and Diversity, Goethe University, Frankfurt, Germany.,Department of Palaeoanthropology, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt am Main, Germany
| | - Fred Spoor
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Centre for Human Evolution Research, Department of Earth Sciences, Natural History Museum, London, United Kingdom.,Department of Anthropology, University College London, London, United Kingdom
| | - Clément Zanolli
- Univ. Bordeaux, CNRS, MCC, PACEA, UMR 5199, F-33600 Pessac, France
| | - Matthew M Skinner
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,School of Anthropology and Conservation, University of Kent, Canterbury, United Kingdom.,Centre for the Exploration of the Deep Human Journey, University of the Witwatersrand, Johannesburg, South Africa
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15
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Yi Z, Zanolli C, Liao W, Wang W. A deep-learning-based workflow to assess taxonomic affinity of hominid teeth with a test on discriminating Pongo and Homo upper molars. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2021; 175:931-942. [PMID: 33860534 DOI: 10.1002/ajpa.24286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 01/18/2021] [Accepted: 03/19/2021] [Indexed: 12/17/2022]
Abstract
OBJECTIVES Convolutional neural network (CNN) is a state-of-art deep learning (DL) method with superior performance in image classification. Here, a CNN-based workflow is proposed to discriminate hominid teeth. Our hope is that this method could help confirm otherwise questionable records of Homo from Pleistocene deposits where there is a standing risk of mis-attributing molars of Pongo to Homo. METHODS AND MATERIALS A two-step workflow was designed. The first step is converting the enamel-dentine junction (EDJ) into EDJ card, that is, a two-dimensional image conversion of the three-dimensional EDJ surface. In this step, researchers must carefully orient the teeth according to the cervical plane. The second step is training the CNN learner with labeled EDJ cards. A sample consisting of 53 fossil Pongo and 53 Homo (modern human and Neanderthal) was adopted to generate EDJ cards, which were then separated into training set (n = 84) and validation set (n = 22). To assess the feasibility of this workflow, a Pongo-Homo classifier was trained from the aforementioned EDJ card set, and then the classifier was used to predict the taxonomic affinities of six samples (test set) from von Koenigswald's Chinese Apothecary collection. RESULTS Results show that EDJ cards in validation set are classified accurately by the CNN learner. More importantly, taxonomic predictions for six specimens in test set match well with the diagnosis results deduced from multiple lines of evidence, implying the great potential of CNN method. DISCUSSION This workflow paves a way for future studies using CNN to address taxonomic complexity (e.g., distinguishing Pongo and Homo teeth from the Pleistocene of Asia). Further improvements include visual interpretation and extending the applicability to moderately worn teeth.
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Affiliation(s)
- Zhixing Yi
- Institute of Cultural Heritage, Shandong University, Qingdao, China.,School of Earth Sciences, China University of Geosciences, Wuhan, China
| | - Clément Zanolli
- Laboratoire PACEA, UMR 5199 CNRS, Université de Bordeaux, Pessac, France
| | - Wei Liao
- Institute of Cultural Heritage, Shandong University, Qingdao, China
| | - Wei Wang
- Institute of Cultural Heritage, Shandong University, Qingdao, China
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16
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A comprehensive survey of Retzius periodicities in fossil hominins and great apes. J Hum Evol 2020; 149:102896. [DOI: 10.1016/j.jhevol.2020.102896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 09/15/2020] [Accepted: 09/15/2020] [Indexed: 10/23/2022]
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17
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Hu R, Zhao L. Molar crown formation times of fossil orangutan molars from Guangxi, China. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2020; 174:315-326. [PMID: 33253429 DOI: 10.1002/ajpa.24183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 09/14/2020] [Accepted: 11/09/2020] [Indexed: 11/06/2022]
Abstract
OBJECTIVES We aimed to investigate molar enamel development in fossil orangutans from Guangxi and shed light on the evolution of Asian great apes. MATERIALS AND METHODS We collected 32 fossil orangutan molars, most of which were from Guangxi apothecaries and the Guangxi Daxin Heidong cave, and prepared histological sections of each molar. We then characterized aspects of dental development, including long period line periodicity, number of Retzius lines and lateral enamel formation time, cuspal enamel thickness, and enamel formation time. RESULTS The long period line periodicity in fossil orangutans ranged from 9 to 10 days (mean, 9.09 days). The molar lateral enamel formation time ranged from 1.48 to 3.17 years (540-1,152 days). Cuspal enamel thickness in fossil orangutan molars ranged from 949 to 2,535 μm, and cuspal enamel formation time ranged from 0.64 to 1.87 years. Molar enamel formation time of fossil orangutans ranged from 2.47 to 4.67 years. DISCUSSION Long-period line periodicity of fossil orangutans from Guangxi was within the variation range of extant orangutans, and the average long period line periodicity (9.09 days) of fossil orangutans from Guangxi in this study was lower than the values for extant orangutans (9.5 days) and fossil orangutans (10.9 days) from Sumatra and Vietnam. Orangutan enamel thickness may have gradually decreased from the Middle Pleistocene to Holocene. Crown formation time of fossil orangutans was slightly longer than that of extant orangutans, and the M1 emergence age of fossil orangutans from Guangxi was about 4-6 years. These findings might indicate the regional difference or evolutionary changes in orangutans since Pleistocene. Dental development of the Guangxi fossil orangutans were more similar to that of Asian Miocene apes, suggesting the closer evolutionary relationship of orangutans to Miocene Asian fossil apes.
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Affiliation(s)
- Rong Hu
- Institute of Anthropology, Department of Anthropology and Ethology, Xiamen University, Xiamen, China
| | - Lingxia Zhao
- Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Science, Beijing, China
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18
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Martín-Francés L, Martinón-Torres M, Martínez de Pinillos M, García-Campos C, Zanolli C, Bayle P, Modesto-Mata M, Arsuaga JL, Bermúdez de Castro JM. Crown tissue proportions and enamel thickness distribution in the Middle Pleistocene hominin molars from Sima de los Huesos (SH) population (Atapuerca, Spain). PLoS One 2020; 15:e0233281. [PMID: 32511250 PMCID: PMC7279586 DOI: 10.1371/journal.pone.0233281] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 05/01/2020] [Indexed: 11/29/2022] Open
Abstract
Dental enamel thickness, topography, growth and development vary among hominins. In Homo, the thickness of dental enamel in most Pleistocene hominins display variations from thick to hyper-thick, while Neanderthals exhibit proportionally thinner enamel. The origin of the thin trait remains unclear. In this context, the Middle Pleistocene human dental assemblage from Atapuerca-Sima de los Huesos (SH) provides a unique opportunity to trace the evolution of enamel thickness in European hominins. In this study, we aim to test the hypothesis if the SH molar sample approximates the Neanderthal condition for enamel thickness and/or distribution. This study includes 626 molars, both original and comparative data. We analysed the molar inner structural organization of the original collections (n = 124), belonging to SH(n = 72) and modern humans from Spanish origin (n = 52). We compared the SH estimates to those of extinct and extant populations of the genus Homo from African, Asian and European origin (estimates extracted from literature n = 502). The comparative sample included maxillary and mandibular molars belonging to H. erectus, East and North African Homo, European Middle Pleistocene Homo, Neanderthals, and fossil and extant H. sapiens. We used high-resolution images to investigate the endostructural configuration of SH molars (tissue proportions, enamel thickness and distribution). The SH molars exhibit on average thick absolute and relative enamel in 2D and 3D estimates, both in the complete crown and the lateral enamel. This primitive condition is shared with the majority of extinct and extant hominin sample, except for Neanderthals and some isolated specimens. On the contrary, the SH molar enamel distribution maps reveal a distribution pattern similar to the Neanderthal signal (with thicker enamel on the lingual cusps and more peripherally distributed), compared to H. antecessor and modern humans. Due to the phylogenetic position of the SH population, the thick condition in molars could represent the persistence of the plesiomorphic condition in this group. Still, more data is needed on other Early and Middle Pleistocene populations to fully understand the evolutionary meaning of this trait.
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Affiliation(s)
- Laura Martín-Francés
- CNRS, MCC, PACEA, UMR 5199, Univ. Bordeaux, Bordeaux, France
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, United Kingdom
| | - María Martinón-Torres
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, United Kingdom
| | - Marina Martínez de Pinillos
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, United Kingdom
| | - Cecilia García-Campos
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, United Kingdom
| | - Clément Zanolli
- CNRS, MCC, PACEA, UMR 5199, Univ. Bordeaux, Bordeaux, France
| | - Priscilla Bayle
- CNRS, MCC, PACEA, UMR 5199, Univ. Bordeaux, Bordeaux, France
| | - Mario Modesto-Mata
- Equipo Primeros Pobladores de Extremadura, Casa de la Cultura Rodríguez Moñino, Cáceres, Spain
| | - Juan Luis Arsuaga
- Centro Mixto Universidad Complutense de Madrid - Instituto de Salud Carlos III de Evolución y Comportamiento Humanos, Madrid, Spain
- Departamento de Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Madrid, Spain
| | - José María Bermúdez de Castro
- Centro Nacional de Investigación sobre la Evolución Humana, Burgos, Spain
- Anthropology Department, University College London, London, United Kingdom
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19
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Zanolli C, Schillinger B, Kullmer O, Schrenk F, Kelley J, Rössner GE, Macchiarelli R. When X-Rays Do Not Work. Characterizing the Internal Structure of Fossil Hominid Dentognathic Remains Using High-Resolution Neutron Microtomographic Imaging. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2020.00042] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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20
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Ortiz A, Bailey SE, Delgado M, Zanolli C, Demeter F, Bacon A, Nguyen TMH, Nguyen AT, Zhang Y, Harrison T, Hublin J, Skinner MM. A distinguishing feature of
Pongo
upper molars and its implications for the taxonomic identification of isolated hominid teeth from the Pleistocene of Asia. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2019; 170:595-612. [DOI: 10.1002/ajpa.23928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 06/25/2019] [Accepted: 09/05/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Alejandra Ortiz
- Department of Anthropology New York University New York New York
- Institute of Human Origins, School of Human Evolution and Social Change, Arizona State University Tempe Arizona
| | - Shara E. Bailey
- Department of Anthropology New York University New York New York
- Department of Human Evolution Max Planck Institute for Evolutionary Anthropology Leipzig Germany
| | - Miguel Delgado
- División Antropología, Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata La Plata República Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Buenos Aires República Argentina
- Ministry of Education Key Laboratory of Contemporary Anthropology and Collaborative Innovation Center of Genetics and Development School of Life Sciences and Human Phenome Institute, Fudan University Shanghai People's Republic of China
| | - Clément Zanolli
- Laboratoire PACEA, UMR 5199, CNRS Université de Bordeaux Bordeaux France
| | - Fabrice Demeter
- Musée de l'Homme, UMR7206 Département Homme et Environnement Paris France
- Lundbeck Foundation GeoGenetics Centre, Globe Institute University of Copenhagen Copenhagen Denmark
| | - Anne‐Marie Bacon
- Laboratoire BABEL, Faculté de Chirurgie Dentaire FRE 2029 CNRS, Université Paris Descartes Montrouge France
| | - Thi M. H. Nguyen
- Anthropological and Palaeoenvironmental Department The Institute of Archaeology Hanoi Vietnam
| | - Anh T. Nguyen
- Anthropological and Palaeoenvironmental Department The Institute of Archaeology Hanoi Vietnam
| | - Yingqi Zhang
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) Chinese Academy of Sciences Beijing People's Republic of China
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing People's Republic of China
| | - Terry Harrison
- Department of Anthropology New York University New York New York
| | - Jean‐Jacques Hublin
- Department of Human Evolution Max Planck Institute for Evolutionary Anthropology Leipzig Germany
| | - Matthew M. Skinner
- Department of Human Evolution Max Planck Institute for Evolutionary Anthropology Leipzig Germany
- School of Anthropology and Conservation University of Kent Canterbury United Kingdom
- Evolutionary Studies Institute University of Witwatersrand Johannesburg South Africa
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21
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Evidence for increased hominid diversity in the Early to Middle Pleistocene of Indonesia. Nat Ecol Evol 2019; 3:755-764. [PMID: 30962558 DOI: 10.1038/s41559-019-0860-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 02/28/2019] [Indexed: 11/08/2022]
Abstract
Since the first discovery of Pithecanthropus (Homo) erectus by E. Dubois at Trinil in 1891, over 200 hominid dentognathic remains have been collected from the Early to Middle Pleistocene deposits of Java, Indonesia, forming the largest palaeoanthropological collection in South East Asia. Most of these fossils are currently attributed to H. erectus. However, because of the substantial morphological and metric variation in the Indonesian assemblage, some robust specimens, such as the partial mandibles Sangiran 5 and Sangiran 6a, were formerly variably allocated to other taxa (Meganthropus palaeojavanicus, Pithecanthropus dubius, Pongo sp.). To resolve the taxonomic uncertainty surrounding these and other contentious Indonesian hominid specimens, we used occlusal fingerprint analysis (OFA) to reconstruct their chewing kinematics; we also used various morphometric approaches based on microtomography to examine the internal dental structures. Our results confirm the presence of Meganthropus as a Pleistocene Indonesian hominid distinct from Pongo, Gigantopithecus and Homo, and further reveal that Dubois's H. erectus paratype molars from 1891 are not hominin (human lineage), but instead are more likely to belong to Meganthropus.
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