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. 2019 Sep 12;19:179. doi: 10.1186/s12862-019-1506-0

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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. 3 — PC1/PC2 scatterplot of the bgPCA on humeral shape variables. Deformation grids refer to positive and negative extremes of the axes. Black silhouettes represent fossorial species, blue silhouettes represent non-fossorial species. Deformation grids shows color according to log(det(jacobian)) coming from the two-dimensional Thin Plate Spline first derivative evaluated within the body. Values < 0 indicate that, with respect to the source (here the sample’ consensus), the target (here the PC’s extremes) experiences a reduction in the local area, while values > 0 indicate an enlargement. Animal silhouettes were available under Public Domain license at phylopic (http://phylopic.org/). Specifically, shrew-mole (http://phylopic.org/image/822c549b-b29b-47eb-9fe3-dc5bbb0abccb/), this image is available for reuse under the Public Domain Dedication 1.0 license; Talpa europaea (http://phylopic.org/image/0465d81c-0def-4478-af15-a075d472e957/), this image is available for reuse under the Public Domain Dedication 1.0 license; Condylura (http://phylopic.org/image/8b656a93-ecf3-4985-8f4d-1f5c032d1a27/), available for reuse and under the Creative Commons Attribution 3.0 Unported (https://creativecommons.org/licenses/by/3.0/) image by Didier Escouens (vectorized by T. Michael Keesey). Desmans (http://phylopic.org/image/f6146c1d-874f-45a8-9d5c-eff0d9df0802/), this image is available for reuse under the Public Domain Dedication 1.0