Nature 317: 525–527īutler PM (1952) The milk molars of perissodactyla, with remarks on molar occlusion. Scanning Electron Microsc 1978 II: 991–1002īromage TG, Dean MC (1985) Re-evaluation of age at death of immature fossil hominids. Anat Embryol 165: 193–212īoyde A, Jones SJ, Reynolds PS (1978) Quantitative and qualitative studies of enamel etching with acid and EDTA. thesis, University of London, London, England.īoyde A, Martin LB (1982) Enamel microstructure determination in hominoid and cercopithecoid primates. White, Philadelphiaīoyde A (1964) The structure and development of mammalian enamel. Am J Phys Anthropol 86: 189–203īeynon AD, Clayton CB, Ramirez-Rozzi FV, Reid DJ (1998) Radiographic and histological methodologies in estimating the chronology of crown development in modern humans and great apes: a review, with some applications for studies on juvenile hominids. Nature 335: 509–514īeynon AD, Dean MC, Reid DJ (1991) Histological study on the chronology of the developing dentition in gorilla and orangutan.
#Humans and chimpanzee teeth canine comparison series#
Philos Trans R Soc Lond Series B 234: 471–484īeynon AD, Dean MC (1988) Distinct dental development patterns in early fossil hominids. Am J Phys Anthropol 99: 119–133Īshton EH, Zuckerman S (1950) Some quantitative dental characteristics of the chimpanzee, gorilla, and orang-utan. Am J Phys Anthropol 86: 229–241Īnemone RL, Mooney MP, Siegel MI (1996) Longitudinal study of dental development in chimpanzees of known chronological age: implications for understanding the age at death of Plio-Pleistocene hominids. This process is experimental and the keywords may be updated as the learning algorithm improves.Īnemone RL, Watts ES, Swindler DR (1991) Dental development of known-age chimpanzees, Pan troglodytes (Primates: Pongidae). These keywords were added by machine and not by the authors. Through techniques such as these will come a better understanding of the intricacies of dental function and a clearer picture of our past. Finally, landmark-free analyses of tooth shape and wear are giving researchers the chance to actually monitor how teeth are used in living primates and by extrapolation in fossil primates too. More realistic perspectives on the physical properties of foods are yielding new functional interpretations of differences in tooth size. In essence, genetic analyses are changing our perspectives on the evolution of morphology, while improved studies of dental development and microstructure have yielded permanent markers of developmental history and microstructural differences of functional significance. This chapter is a brief review of recent advances. Because larger male canine teeth are associated with increased aggression and competition between males in extant anthropoids, the results suggest a behavioral shift early in human evolution toward reduced aggression between males, likely mediated by female choice, according to the authors.Improvements in the primate fossil record, and in methods of data acquisition and analysis, have set the stage for new insights into the development, function, and evolution of hominoid teeth. This estimate places the reduction of male canine teeth early in human evolution, broadly coinciding with the development of bipedalism.
ramidus was lower than in bonobos, the extant ape with the lowest canine tooth dimorphism, and comparable to levels seen in modern humans. The authors estimate that canine tooth sexual dimorphism in A. The results suggest that weak canine tooth sexual dimorphism has characterized members of the human clade since as early as in A. The timing of emergence of weak canine tooth sexual dimorphism in human evolution is unclear, partly due to the difficulty of reliably determining dimorphism in weakly dimorphic fossils. Gen Suwa and colleagues applied statistical methods to estimate and compare levels of sexual dimorphism in a dataset of fossil canine teeth, including all available Ardipithecus ramidus fossils as well as fossils from Australopithecus spp., Homo spp., and extinct apes. Proportionally, humans have the smallest male canine teeth among all anthropoids and exhibit little sexual dimorphism in canine tooth size. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES-A reduction in male canine tooth size and, possibly, aggression occurred early in human evolution, according to a study.
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