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. 2018 Apr 2;18:42. doi: 10.1186/s12862-018-1165-6

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© The Author(s). 2018

Open Access This 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. 5 — Bivariate plots of ventral and dorsal valves of Eohadrotreta zhenbaensis from South China. a plots of protegulum length – metamorphic shell length ratio of ventral and dorsal valves. b plots of the length ratio of bs/ms (brephic shell / metamorphic shell) – metamorphic shell length ratio of ventral and dorsal valves. c plots of protegulum width –metamorphic shell width ratio of ventral and dorsal valves. d plots of length– width ratio of protegula of ventral and dorsal valves, and plots of length– width ratio of ventral pedicle foramen. Abbreviations: ms, metamorphic shell; pr, protegulum