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. 2020 Feb 13;3:68. doi: 10.1038/s42003-020-0779-6

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© The Author(s) 2020

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. 2 — a Principal coordinate axis 1 (26.0% of total variance) against axis 2 (6.5% of total variance). b Principal coordinate axis 1 against axis 3 (5.64% of total variance). Ordinated maximum observed rescaled distance matrix calculated from the cladistic data set of Moon²⁰ binned into epochs. Silhouettes of indicative taxa (Grippia longirostris [D. Bogdanov, vectorized by M. Keeley], Ichthyosaurus communis [G. Monger], Mixosaurus cornalianus [G. Monger], Ophthalmosaurus icenicus [G. Monger], Platypterygius sachicarum [Zimices], and Shastasaurus sikkaniensis [G. Monger]) show their relative positions. Images downloaded from PhyloPic and used under a CC-BY 3.0 licence: https://creativecommons.org/licenses/by/3.0/.