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. 2020 May 1;20:50. doi: 10.1186/s12862-020-01614-7

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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. 1 — Morphological and ecological comparisons among Tridacninae (Tridacna squamosa) and Fraginae (Fragum fragum, Corculum cardissa) species. a. Lateral shell views of the three species and diagrams showing their typical positions in natural habitats. Yellow rectangles represent sediment. Note that F. fragum and C. cardissa both show different degrees of posterior shell compression. b–d. Photos of the three species in their natural habitat. F. fragum (c) was taken out of the sediment when photo was taken. Photo credits: Jingchun Li and Jeff Whitlock (the Online Zoo). Images were processed in Affinity Designer 1.8.4 (Serif Ltd.)