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. 2019 Apr 2;9:5510. doi: 10.1038/s41598-019-41290-2

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© The Author(s) 2019

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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(A) Ancestral area reconstruction of the viperines. Genera are shaded, and species are in the same order as in Fig. 3. The four biogeographic areas defined for the analyses are shown in the map. Probabilities of the regions to be ancestral to a clade are shown as pie charts on the given nodes. (B) Results of the alternative biogeographic analysis that included all members of the Azemiopinae and Crotalinae. A complete tree with all 282 tips is shown in Supplementary Fig. S2.