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Testing the Cambrian explosion hypothesis by using a molecular dating technique

L Bromham1, A Rambaut, R Fortey

  • 1Department of Zoology, University of Oxford, Oxford OX1 3PS, United Kingdom. LBromham@zoology.uq.edu.au

Proceedings of the National Academy of Sciences of the United States of America
|October 15, 1998
PubMed
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Molecular data offers new insights into animal phyla origins. Findings suggest a prolonged Precambrian diversification, challenging the rapid Cambrian explosion hypothesis for metazoan phyla evolution.

Area of Science:

  • Evolutionary biology
  • Molecular phylogenetics
  • Animal origins

Background:

  • Molecular studies estimate divergence times crucial for understanding animal phyla origins.
  • Previous molecular clock methods faced criticism for not adequately addressing evolutionary rate variation.

Purpose of the Study:

  • To present a refined molecular dating method that accounts for evolutionary rate variation.
  • To re-evaluate the timeline of metazoan phyla diversification.

Main Methods:

  • Development and application of a novel method for dating molecular divergence times.
  • Analysis of molecular data to estimate evolutionary rates and divergence periods.

Main Results:

  • The refined method yields more realistic, albeit wider, confidence intervals for divergence times.

Related Experiment Videos

  • Molecular data are inconsistent with the Cambrian explosion as the sole explanation for metazoan phyla origins.

    • Conclusions:

    • Evidence supports an extended period of metazoan diversification during the Precambrian.
    • The findings necessitate a revised understanding of early animal evolution beyond the Cambrian explosion.