Endocuticle sclerotisation increases the mechanical stability of cuticle

Lu Yi Wang, Mohsen Jafarpour, Chung Ping Lin, Esther Appel, Stanislav N. Gorb, Hamed Rajabi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The cuticle plays an important role in the evolutionary success of insects. Many studies on insect cuticles have reported a soft, resilin-rich endocuticle. However, a recent study indicated the presence of a sclerotised endocuticle in the weevil Pachyrhynchus sarcitis kotoensis, which contradicts former knowledge. To understand the degree of sclerotisation in the endocuticle of the weevil and its potential function, we first examined the endocuticle by microscopic and staining techniques. We next performed mechanical tests to measure the material properties of the endocuticle, and numerical simulations to predict the structural effect of the sclerotisation. Our results provide the first evidence of the existence of a sclerotised endocuticle and its remarkable function in improving the mechanical stability of the cuticle. This study highlights the finding of a high degree of sclerotisation in the stiff endocuticle of the weevil, especially the matrix surrounding the fibres. This novel case brings new understanding of cuticle properties and gives promising insights into biomaterial design.

Original languageEnglish
Pages (from-to)8272-8278
Number of pages7
JournalSoft Matter
Issue number41
Publication statusPublished - 2019

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics


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