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. 2021 Feb 18;4:216. doi: 10.1038/s42003-021-01714-0

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© The Author(s) 2021

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Complete thickness of the gladius in the median field area (central part of the gladius) with marked lamination, identical to the Recent gladius-bearing coleoids. b Detail of laminated gladius. c, d Details of the gladius surface. Note, the original β-chitin material has predominantly been replaced by (hydroxyl)apatite and gypsum during diagenetic and postdiagenetic processes.