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Tempo and mode in human evolution

H M McHenry1

  • 1Department of Anthropology, University of California, Davis 95616.

Proceedings of the National Academy of Sciences of the United States of America
|July 19, 1994
PubMed
Summary

Human evolution shows mosaic morphological change, with early bipedalism and later craniodental adaptations. Brain size expanded with Homo, but trends may reflect rapid species shifts.

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Area of Science:

  • Paleoanthropology
  • Evolutionary Biology
  • Geochronology

Background:

  • Paleontological discoveries and geochronology are advancing rapidly.
  • Hominid lineage evolution presents a complex, non-linear pattern of change.

Purpose of the Study:

  • To analyze the mosaic pattern of morphological evolution in the hominid lineage.
  • To investigate the timing and nature of craniodental and locomotor adaptations.

Main Methods:

  • Analysis of new paleontological data.
  • Integration of advanced geochronological dating techniques.
  • Comparative morphological analysis of fossil hominids.

Main Results:

  • Early hominids show early bipedal adaptations but primitive craniodental features.
  • Craniodental evolution suggests parallel evolution in masticatory features across lineages.
  • Brain size increased gradually in Australopithecus, significantly in Homo, then plateaued in early Homo.

Conclusions:

  • Hominid evolution is characterized by mosaicism, not gradualism.
  • Apparent evolutionary trends may result from rapid shifts between species.
  • Understanding hominid evolution requires considering parallel evolution and mosaic change.

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