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It's time to consider the Arcellinida shell as a weapon.

Kenneth Dumack1, Enrique Lara2, Clément Duckert3

  • 1Terrestrial Ecology, Zülpicher Straße 47b, University of Cologne, Germany.

European Journal of Protistology
|January 9, 2024
PubMed
Summary

The shells of testate amoebae are not just for defense; they are weapons used to attack large prey. This discovery changes our understanding of protistology and evolutionary studies.

Keywords:
AmoebaeAmoebozoaEukaryvoryFunctional traitsPredator–preyTestate amoebae

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Area of Science:

  • Protistology
  • Evolutionary Biology
  • Ecology

Background:

  • Testate amoebae shells are diverse and environmentally persistent.
  • Shell morphology and composition are key in ecological and evolutionary studies.
  • The shell's function has been primarily viewed as defensive, based on limited evidence.

Purpose of the Study:

  • To investigate the functional role of the arcellinid testate amoebae shell beyond defense.
  • To propose a new hypothesis regarding the shell's involvement in prey capture.
  • To re-evaluate the ecological and evolutionary significance of the testate amoebae shell.

Main Methods:

  • Analysis of recent evidence on testate amoebae behavior and shell morphology.
  • Comparative studies on shell structure and function in arcellinid species.
  • Reinterpretation of existing data in light of new functional hypotheses.

Main Results:

  • Evidence suggests the shell is crucial for attacking large prey, not solely for defense.
  • The shell acts as a weapon, facilitating prey capture.
  • This challenges the traditional view of the shell as a passive protective structure.

Conclusions:

  • The shell of arcellinid testate amoebae functions as a weapon in prey acquisition.
  • This revised perspective opens new research avenues in protistology.
  • It necessitates a substantial shift in ecological, palaeoecological, and evolutionary research paradigms.