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Related Experiment Video

Updated: Apr 10, 2026

An Experimental Human DIEP Flap Model to Investigate Preservation Strategies for Vascularized Composite Allografts and Free Flaps
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An Experimental Human DIEP Flap Model to Investigate Preservation Strategies for Vascularized Composite Allografts and Free Flaps

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Palaeontology: in a flap about flaps.

Gregory D Edgecombe1

  • 1Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK.

Current Biology : CB
|June 17, 2015
PubMed
Summary

A newly discovered Ordovician anomalocaridid reveals a second set of body flaps. This finding challenges current understanding of arthropod leg evolution and their diverse body plans.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Arthropod Science

Background:

  • The evolution of arthropod appendages is a key area in understanding their diversification.
  • Anomalocaridids represent early, large Cambrian predators with unique body plans.

Purpose of the Study:

  • To describe a new anomalocaridid fossil from the Ordovician period.
  • To investigate the implications of its morphology for arthropod leg evolution.

Main Methods:

  • Fossil excavation and preparation.
  • Detailed morphological analysis of the fossil specimen.
  • Comparative anatomical studies with other arthropods.

Main Results:

  • Discovery of an anomalocaridid exhibiting a previously undocumented second pair of body flaps.

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  • The new morphology suggests a more complex evolutionary pathway for arthropod appendages than previously thought.

    • Conclusions:

    • The findings necessitate a re-evaluation of the evolutionary origins of arthropod leg biramousness.
    • This discovery highlights the potential for new interpretations of early arthropod body plans and locomotion.