Declarations
Ethics approval and consent to participate. Not applicable.
Consent for publication. Not applicable
Data Accessibility Statement. The 3D modell will be deposited in Dryad. The data on mechanical properties and elemental analysis can be found in the Supplementary.
Competing interests. The authors declare that they have no competing interests
Funding. This research was financed by the DFG grant KR 5540/2-1 to WK.
Authors’ contributions. WK, SG, and HW initiated the study. WK performed nanoindentation, WK and CN performed SEM and EDX analyses. WK wrote the first draft of the manuscript. AK modelled the radular teeth. All authors contributed to and approved the final version of the manuscript for publication.
Acknowledgements. We would like to thank Elke Woelken from the Institute of Cell and Systems Biology of Animals, Universität Hamburg, for their support on the SEM. We are highly grateful for the helpful comments of the anonymous reviewers.