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. 2022 Feb 1;12:1707. doi: 10.1038/s41598-022-05540-0

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© The Author(s) 2022

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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Proposed prenatal stages and earliest postnatal developmental stage of Stenopterygius quadriscissus on the basis of cranial ossification of single elements and suture closure. Stage 3 is subdivided into 3a and 3b on the basis of ossification of isolated elements and only represented by disarticulated material. Stage 1, SMNS 10460; Stage 2, SMNS 50963; Stage 4, SMNS 54064; Postnatal 1, SMNS 12821. an angular, ar articular, de dentary, fr frontal, fr-oli frontal olfactory lobe indentation, ju jugal, la lacrimal, mx maxilla, na nasal, nac nasal capsule, pa parietal, pa-opi parietal optic lobe indentation, pmx premaxilla, po postorbital, pof postfrontal, prf prefrontal, qj quadratojugal, qu quadrate, scl sclerotic plate, sp splenial, sq squamosal, st supratemporal, su surangular, vo vomer. Scale bar (all parts) = 50 mm.