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. 2019 May 17;19:104. doi: 10.1186/s12862-019-1432-1

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© The Author(s). 2019

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. 1 — Phylomorphospaces of the original shape data. Points coloured by clade (a, b) and diet (c, d). PC1 vs PC2 (a, c) and PC2 vs PC3 (b, d). Inset skulls characterise the shapes represented by the maximum and minimum end warps of their corresponding PC axes