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Why are arthropods segmented?

G E Budd1

  • 1Department of Earth Sciences, Uppsala University, Sweden. graham.budd@pal.uu.se

Evolution & Development
|November 17, 2001
PubMed
Summary
This summary is machine-generated.

Segmentation is redefined as an organ attribute, not organismal. Examining arthropod epidermis evolution reveals complex pathways influencing genetic and developmental frameworks.

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Area of Science:

  • Evolutionary developmental biology
  • Comparative morphology
  • Phylogenetics

Background:

  • Current discussions on organismal segmentation are complicated by new phylogenies and molecular data.
  • Existing definitions of segmentation are ambiguous and typological.
  • Segmentation is considered a key character in theories of bilaterian origins and evolutionary modularity.

Purpose of the Study:

  • To re-evaluate the definition and evolutionary significance of segmentation.
  • To investigate the evolution of segmentation within the arthropod epidermis.
  • To explore the role of functional morphology in developmental evolution.

Main Methods:

  • Analysis of the fossil record.
  • Examination of extant euarthropods, tardigrades, and onychophorans.

Related Experiment Videos

  • Comparative study of organ systems and their evolutionary pathways.

    • Main Results:

    • Segmentation is proposed as an attribute of organs, not organisms.
    • The evolution of arthropod epidermal segmentation involved complex functional shifts and changes in associated organs.
    • The evolutionary pathway of segmentation highlights the interplay between morphology, function, and genetics.

    Conclusions:

    • Reconceptualizing segmentation as an organ-level attribute clarifies its evolutionary trajectory.
    • The evolution of segmentation in arthropod epidermis demonstrates a complex process with significant implications for developmental genetics.
    • Evolutionary functional morphology is crucial for understanding the framework of developmental evolution.