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. 2020 Jan 13;375(1793):20190132. doi: 10.1098/rstb.2019.0132

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) Reconstruction of the osteoderm vascular area on the phylogeny of Pseudosuchia using a least-square reconstruction. The phylogeny was reconstructed and time-scaled according to published references [5,51–58]. The light blue arrows represent the transitions from a terrestrial to a semi-aquatic lifestyle. (b) Reconstruction of the dermal scute vascular area on the phylogeny of Testudinata using a least-square reconstruction. The phylogeny was reconstructed and time-scaled according to published references [41,42,59–63]. The dark blue arrows represent the transitions from a freshwater to a marine lifestyle. The green arrow represents a transition from a freshwater to a terrestrial lifestyle. Regarding the dermal plates, which belong to the same species or specimen, we decided to separate them from a 1 Myr-old last hypothetical common ancestor: a systematic error which is below 1% when considering the total branch length within the phylogeny timescale (180 Ma for the testudinatans and 250 Ma for the pseudosuchians). Paleog, Paleogene, Ne, Neogene.