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. 2020 Jul 2;10:10955. doi: 10.1038/s41598-020-67863-0

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© The Author(s) 2020

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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Osteohistological features of the Lestodon armatus specimens from Playa del Barco site. (A–C) General view of the spinous vertebral processes cross sections belonging to juvenile (MD-PDB-16-23), adult (MD-PDB- without catalogue number), and senile (MD-PDB-05-63) individuals. (D,E) details of the bone microstructure of the juvenile individual, in natural light, showing the primary bone tissue partially remodeled. Note the presence of three lines of arrested growth (LAGs, white arrows). (F,G) details of the bone microstructure of the adult individual, in natural light, showing the primary bone tissue (as a remnant) intensely remodeled. (H–I) details of the bone microstructure of the senile individual, in natural light, showing the primary bone tissue completely remodeled. cc: compact cortex. lc longitudinal channels, mc medullary cavity, ol osteocyte lacunae, pbt primary bone tissue, rc resorption cavity, Shf Sharpey’s fibers, so secondary osteon. Black scale bars = 1 cm.