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. 2022 Apr 12;19:15. doi: 10.1186/s12983-022-00461-0

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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 — Three-dimensional reconstruction of the arm tip of A. kochii. The following anatomical structures are shown: epidermis (semitransparent violet), ectoneural part of the nervous system (green), hyponeural part of the nervous system (magenta), water-vascular system (red), arm coelom (yellow), and intervertebral muscles (brown). (a) Oral view. (b) Aboral view. (c) Side view. (d) Oblique side view, arm coelom not shown. The edge length of the scale cube (grey) is 25 $μ$ m. a—aboral; c—arm coelom (somatocoel); d—distal; e—epidermis; en—ectoneural system; hn—hyponeural system; l—left; m—intervertebral muscles; o—oral; p—proximal; pd—hydrocoelic lining of the podia (tube feet); r—right; s $_{2}$ —s $_{5}$ —subterminal arm segments 2 thru 5; t—terminal segment; wvc—hydrocoelic water-vascular canal. The 3D video animation of this anatomical model is available in Additional file 2. The original Blender model used to produce this figure and the video is available in Zenodo (https://doi.org/10.5281/zenodo.5762494)