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. 2022 Jun 11;19:19. doi: 10.1186/s12983-022-00465-w

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — EDX and nanoindentation data obtained from native radulae (n = 3). a Light microscopy image of one radula, tooth rows are numbered, and the zones (radular sac, mineralization zone, working zone) are defined. b Changes in Young’s modulus, GPa, during ontogeny for each tooth type and tooth part (Ba, basis; Cu, cusp; St, stylus). c Changes in Fe and Ca proportions (atomic %) during ontogeny for each tooth type and tooth part. Dots represent values measured and solid lines trend lines based on the individual measurements. Scale bar: a = 250 μm