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Convergent Evolution of Cellular Weaponry.

Maia V Palka¹, Brian S Leander^1,2

¹1Department of Botany, Beaty Biodiversity Research Centre and Museum, University of British Columbia, Vancouver, British Columbia, Canada ; email: maia.palka@gmail.com, bleander@mail.ubc.ca.

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|July 13, 2026

Summary

Cellular weaponry, known as extrusomes, has evolved convergently across eukaryotes for functions like prey capture and defense. These diverse structures show significant evolutionary adaptation and diversification.

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Area of Science:

* Evolutionary Biology
* Cell Biology
* Protistology

Background:

* Eukaryotes utilize diverse ballistic structures called extrusomes for various functions.
* Extrusomes exhibit significant morphological diversity and have evolved independently multiple times.
* These structures play roles in prey capture, defense, and host cell invasion.

Purpose of the Study:

* To synthesize the diversity and phylogenetic distribution of eukaryotic cellular weaponry.
* To explore novel examples of convergent evolution in cellular weapon systems.
* To understand the evolutionary pressures driving the development of extrusomes.

Main Methods:

* Comparative analysis of extrusome morphology and function across eukaryotic taxa.
* Phylogenetic reconstruction to trace the independent evolution of extrusomes.
* Literature review and synthesis of existing data on cellular weaponry.

Main Results:

* Extrusomes are widespread across eukaryotes, demonstrating extensive convergent evolution.
* Significant morphological and functional divergence of homologous extrusomes observed, especially with lifestyle shifts.
* Analogous cellular weaponry found at multiple biological scales, from protists to multicellular organisms.

Conclusions:

* Cellular weaponry represents a prime example of convergent evolution driven by ecological pressures.
* The study highlights the remarkable adaptability of cellular structures for survival and interaction.
* Extrusomes provide insights into the evolution of complex biological systems across diverse life forms.