Biomechanical strategies underlying the robust body armour of an aposematic weevil

Lu Yi Wang, Hamed Rajabi, Nima Ghoroubi, Chung Ping Lin, Stanislav N. Gorb*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Robust body armor is one of many anti-predator strategies used among animal taxa. The exoskeleton of insects can serve as the secondary defense mechanism in combination with the primary defense such as warning color. Aposematic Pachyrhynchus weevils advertise their unprofitability and use their robust exoskeleton for effective defense against lizard predators. While the mature weevils survive after the predatory attack, the soft teneral ones can easily be consumed. To reveal how the mature weevils achieve such effective protection, we investigated the ontogenetic changes in the microstructure and material properties of the exoskeleton of the adult weevils. We also tested the functional role of a weevil-specific structure, the fibrous ridge, in the robustness of the elytral cuticle of the mature weevils. The results showed that the mature weevils have thicker, stiffer and more sclerotized cuticle than the teneral ones. The fibrous ridges in the endocuticle considerably increase the overall stiffness of their cuticle. Together these biomechanical strategies enable Pachyrhynchus weevils to achieve robust body armor that efficiently protects them from lizard predation.

Original languageEnglish
Article number1410
JournalFrontiers in Physiology
Issue numberOCT
Publication statusPublished - 2018 Oct 9


  • Aposematic color
  • Cuticle microstructure
  • Defense mechanism
  • Material property
  • Pachyrhynchus sarcitis kotoensis
  • Stiffness

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)


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