Newborn Size and Pelvic Dimensions of Australopithecus

  title={Newborn Size and Pelvic Dimensions of Australopithecus},
  author={Walter Leutenegger},
IN mammals construction of the pelvis not only reflects functional adaptations to certain modes of locomotion but also depends on maternal-foetal size relationships. Therefore, information about body weight and head size of newborn Australopithecus in relation to the size of the female pelvic inlet is of evolutionary significance with respect to the adaptation of hominids to bipedalism. 

Some implications of relative biomechanical neck length in hominid femora

Fossil hominids through the middle Pleistocene appear to have relatively longer femur necks than expected, excepting the two small australopithecine females, and it is suggested that this variation results from smaller crania at birth in the fossils.

Bipedalism and human birth: The obstetrical dilemma revisited

This obstetrical dilemma was solved by delivery of the fetus at a much earlier stage of development because adaptation to bipedal locomotion decreased the size of the bony birth‐canal at the same time that the exigencies of tool use selected for larger brains.

Size and shape of the australopithecine pelvic bone

The aim of this paper is to present results of a new morphometric analysis of australopithecine pelvic bones to try to understand the reasons of this situation, it appears that australipithecines exhibit the same overall architectural pattern as extant humans, the hominid pattern, just as all African apes also exhibit thesame pongid pattern.

Allometry of neonatal size in eutherian mammals

The scaling of neonatal size in eutherian mammals and primates in particular is investigated and it is demonstrated that neonatal weight in 15 species of anthropoid primates scales at a power of maternal weight of 0.70.

Gestation Period for Australopithecus

It is quite clear that in the higher primates the foetal growth rate is 0.06, and the gestation periods for A. africanus of 257 days and A. robustus 300 days are obtained.

Newborn: adult brain ratios in hominid evolution.

  • H. Jordaan
  • Medicine
    American journal of physical anthropology
  • 1976
An attempt to determine the newborn adult brain ratio in a proto-human population, Australopithecus africanus, and two possible causes of the reduction of the ratio in hominid evolution are discussed.



New Endocranial Values for the Australopithecines

There are substantial differences between the determinations of endocranial volumes and those previously published in australopithecines.

Sex differences in the pelves of primates.

  • A. H. Schultz
  • Psychology
    American journal of physical anthropology
  • 1949