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Nipping the Cambrian "explosion" in the bud?

S C Morris1

  • 1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK. sc113@esc.cam.ac.uk

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|November 21, 2000
PubMed
Summary

The Cambrian explosion

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Area of Science:

  • Evolutionary Biology
  • Paleontology

Background:

  • The Cambrian explosion, a period of rapid diversification of animal life, is debated regarding its timing and evolutionary mechanisms.
  • Existing theories propose either a geologically instantaneous event or a long, cryptic evolutionary history preceding enhanced fossilization potential.
  • Both perspectives face significant challenges in explaining the fossil record.

Purpose of the Study:

  • To propose a novel, third perspective on the assembly of metazoan body plans during the Cambrian period.
  • To reconcile conflicting interpretations of the Cambrian explosion using an integrated approach.

Main Methods:

  • Integration of functional morphology, analysis of the fossil record, and cladistic analysis.
  • Examination of the evolutionary processes underlying the development of animal body plans.

Main Results:

  • The study suggests a more straightforward process for the assembly of metazoan body plans than previously considered.
  • Challenges the notion of a purely instantaneous or solely fossilization-driven event.

Conclusions:

  • A new framework is presented for understanding the Cambrian explosion.
  • The findings advocate for a nuanced view that integrates multiple lines of evidence to explain early animal evolution.

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