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. 2022 Jun 23;12:8292. doi: 10.1038/s41598-022-12269-3

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© The Author(s) 2022

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 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/.

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3D reconstruction and image of the arm crown, and a sample dorsal sucker of V. rhodanica (MNHN.B.74244). (a) Reconstruction of the arm crown (Mimics software) showing 8 arms, with the longer dorsal arm pair (arm pair I). (b) PPC-SRµCT slice of arm pair I (voxel size: 12.64 µm) showing the armature (2 uniserial suckers and flanking pairs of cirri) at the distal section, and the axial nerves. (c,d) 3D reconstruction of a dorsal sucker in profile and oral view respectively. The yellow colour reflects the location of the infundibulum.