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. 2020 Feb 5;6:2. doi: 10.1186/s40851-020-0154-y

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 8 — Richtersius coronifer s.s. (Richters, 1903) from Billefjorden population, egg chorion morphology seen under SEM. a Entire egg. b, c Details of processes. d Details of surface. Arrowhead indicate divided process apices. Scale bars in μm