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Adult chimpanzee teeth11/14/2023 ![]() ![]() ![]() Multivariate analysis of the sexual dimorphism of the hip bone in a modern human population and in early hominids. AL 288-1-Lucy or Lucifer: gender confusion in the Pliocene. Comparison of the pelves of Sts 14 and AL 288-1: implications for birth and sexual dimorphism in australopithecines. Pelvic morphology in Homo erectus and early Homo. The evolution of the human pelvis: changing adaptations to bipedalism, obstetrics and thermoregulation. Pelvic sexual dimorphism in a metatherian, Didelphis virginiana: implications for eutherians. Dimorphism in the size and shape of the birth canal across anthropoid primates. Pelvic sexual dimorphism and relative neonatal brain size really are related. Big-bodied males help us recognize that females have big pelves. Sexual dimorphism and allometry in primate ossa coxae. Sexual dimorphism in the size and shape of the os coxae and the effects of microevolutionary processes. The primate pelvis: allometry or sexual dimorphism? J. The evolution of modern human childbirth. Evolution of the human pelvis and obstructed labor: new explanations of an old obstetrical dilemma. Functional aspects of pelvic morphology in simian primates. Humans as inverted bats: a comparative approach to the obstetric conundrum. Expanding the evolutionary explanations for sex differences in the human skeleton. The reliability of sex determination of skeletons from forensic context in the Balkans. Sex differences in the sciatic notch of great apes and modern humans. Accuracy of sex determination using morphological traits of the human pelvis. Sexual dimorphism in the human bony pelvis, with a consideration of the Neandertal pelvis from Kebara cave, Israel. ![]() Sex differences in the pelves of primates. Developmental evidence for obstetric adaptation of the human female pelvis. Allometry and sexual dimorphism in the human pelvis. Covariation between human pelvis shape, stature, and head size alleviates the obstetric dilemma. We further suggest that this shared pattern was already present in early mammals and propose a hypothesis of facilitated variation as an explanation: the conserved mammalian endocrine system strongly constrains the evolution of the pattern of pelvic differences but enables rapid evolutionary change of the magnitude of sexual dimorphism, which in turn facilitated the rapid increase in hominin brain size.įischer, B. We conclude that this pattern of pelvic sex differences did not evolve de novo in modern humans and must have been present in the common ancestor of humans and chimpanzees, and thus also in the extinct Homo species. Even though the magnitude of sex differences in pelvis shape was two times larger in humans than in chimpanzees, we found that the pattern is almost identical in the two species. Here we compare pelvic sex differences across modern humans and chimpanzees using a comprehensive geometric morphometric approach. It is commonly assumed that the strong sexual dimorphism of the human pelvis evolved for delivering the relatively large human foetuses. ![]()
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