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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. 1 — a Nearly complete gladius, dorsal view, scale bar = 2 cm. b Detail of the apical part forming conus (c), mf median field, lf lateral fields, hbz hyperbolar zones, dashed lines mark the hyperbolar zones separating lateral fields from the median field, scale bar = 2 cm. c Reconstruction of the gladius, red lines demarcate hyperbolar zones, mf enlarged median field, lhf length of hyperbolar zones, scale bar = 10 cm, rectangle shows the postion of the d, scale bar = 2 cm. d Detail of the lateral field with hyperbolar zone and median field, scale bar = 2 cm. e Detail of the median field with marked concentric growth lines (gl).