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. 2020 Nov 10;6:11. doi: 10.1186/s40851-020-00165-5

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© The Author(s) 2020

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. 13 — Histological details of the funiculus of Stephanella hina. All longitudinal sections. a Funiculus in close proximity to the caecum and several developing statoblasts, which are also covered by a thin lining of funicular epithelium. b A funicular strand that encloses a very progressed statoblast anlage. The funicular lining surrounding the latter is very thin. c Proximal end of the caecum showing the origin of the funiculus. d Close-up of a funicular strand, which consists of a thin epithelium surrounding a small central lumen. Abbreviations: bw - body wall, bwm - body wall musculature, ca - cardia, cae - caecum, dsb - developing statoblast, ed. - epidermis, f - funiculus, pt. - peritoneum, rm. - retractor muscles