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. 2021 Jan 19;4:83. doi: 10.1038/s42003-020-01637-2

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© The Author(s) 2021

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Schematic diagram illustrating the current knowledge of whole-genome duplication (WGD) in animals. ‘?R’ denotes unknown rounds of whole-genome duplication; b pictures of horseshoe crabs C. roundicultata and T. tridentatus; c Repeat content for the two horseshoe crab genomes, C. rotundicauda and T. tridentatus: Pie charts illustrating repeat content as a proportion of total genomic content; Repeat content present in genic verses intergenic regions; and Repeat landscape plots illustrating transposable element activity in each horseshoe crab genome. Source data reveals these figures can be found in Supplementary Data 8.