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. 2019 Nov 28;9:17801. doi: 10.1038/s41598-019-53591-7

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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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Growth series of the postorbital in Daspletosaurus (a,d) and Gorgosaurus (b,c,e). Elements shown in lateral view. (a) Small juvenile Daspletosaurus TMP 2013.18.11; (b) Small juvenile Gorgosaurus TMP 1986.144.1; (c) Large juvenile-subadult Gorgosaurus TMP 1994.143.1; (d) Adult Daspletosaurus TMP 2001.36.1; (e) Adult Gorgosaurus UALVP 10. The intermediate large juvenile-subadult Daspletosaurus condition is unknown. Abbreviations as in Figs. 2 and 3. Scale bars equal 50 mm. Institutional abbreviations: TMP, Royal Tyrrell Museum of Palaeontology; UALVP, University of Alberta Laboratory of Vertebrate Paleontology.