Acknowledgements
We thank the Gans Fund for funding this study. MS was also funded by the European Union H2020 – Marie Skłodowska-Curie Global Fellowship (GA101024700). Special thanks to the people and institutions who provided specimens for our sample: Anthony Herrel (MNHN), David Kizirian and Lauren Vonnahme from the herpetology collection of the American Museum of Natural History (New York), Nicolas Vidal from the herpetology collection of the Museum National d’Histoire Naturelle (Paris), Marc Herbin (MNHN), Boaz Schacham from the herpetology collection of Jerusalem, Rémi Ksas and Antoine Planelles (Venomworld), Ya-Wei Li, Vincent Prémel, Ludovic Faure, Yoan Eynac and Karine Falco. We thank Mathilde Bouchet from ENS Lyon for her time helping to set the specimens and teaching MS to use the CT scanner, and Adrien Izzet for his explanations about curvature and angles.
Conflicts of interest/Competing interests: The authors declare no conflict of interest.
Availability of data and material: The Rdata and Rcode will be provided in a Dryad repository upon acceptance of the manuscript and the 3D scans will be uploaded in MorphoSource.
Authors’ contributions: MS and MD conceived and led the research project. MS, CH, AD help collecting the data. MS led the writing of the manuscript. RC, RS, JM, AH helped in writing the grant proposal. All authors contributed to the interpretation and discussion of the results, and to the editing of the manuscript.