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. 2021 Apr 16;11:8338. doi: 10.1038/s41598-021-87495-2

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Cranial morphology of Chrysobatrachus, Callixalus, and Acanthixalus. Reconstructions in dorsal, frontal, and lateral views are based on high-resolution X-ray microcomputed tomography. From left to right: Chrysobatrachus cupreonitens (CAS 145263, male), Callixalus pictus (CAS 145260, male), and Acanthixalus spinosus (CAS 153800, female). Skull views are scaled to a similar size among the three genera.