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The origin and evolution of segmentation.

G K Davis1, N H Patel

  • 1Committee on Developmental Biology, University of Chicago, Chicago, IL 60637, USA. gdavis@midway.uchicago.edu

Trends in Cell Biology
|December 28, 1999
PubMed
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The evolution of segmentation in arthropods, annelids, and chordates is debated. This review examines segmentation processes across these phyla to understand if it evolved independently or from a common ancestor.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Comparative Zoology

Background:

  • Segmentation is a fundamental body plan feature observed in diverse animal phyla, including arthropods, annelids, and chordates.
  • The evolutionary origin of segmentation remains a significant question in biology, with hypotheses suggesting independent evolution or a shared ancestral origin.

Purpose of the Study:

  • To review current knowledge on the segmentation process across different animal phyla.
  • To explore and compare proposed evolutionary pathways for the development of segmentation.

Main Methods:

  • Comparative analysis of segmentation mechanisms in arthropods, annelids, and chordates.
  • Review of existing literature on developmental genetics and evolutionary developmental biology related to segmentation.

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Main Results:

  • Segmentation processes exhibit both conserved and divergent features across the studied phyla.
  • Variations in segmentation within phyla highlight the complexity of its evolutionary history.

Conclusions:

  • The independent evolution of segmentation in arthropods, annelids, and chordates is a plausible hypothesis.
  • Further research is needed to definitively resolve the homology of segments and the evolutionary origins of segmentation.