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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/.

PMC Copyright notice

Pterygoids of selected specimens of Stenopterygius in ventral (A,C–D,F–G) and dorsal (B,E,H) view. Interpretative drawings denoted by an apostrophe with their corresponding letter. (A) stage 3 embryo S. quadriscissus SMNS 80234; (B) stage 3 embryo S. quadriscissus SMNS 80234; (C) stage 4 embryo S. quadriscissus SMNS 54062; (D) postnatal 1 S. quadriscissus SMNS 51139; (E) postnatal ?2 Stenopterygius quadriscissus 50183; (F) postnatal 2 S. quadriscissus SMNS 81958; (G) sexually mature S. quadriscissus SMNS 81961; (H) sexually mature S. quadriscissus SMNS 80234. lw lateral wing, plf palatine facet, ptr antimeric pterygoid ramus, qr bsf quadrate ramus, medial (basisphenoid) flange, qr df quadrate ramus dorsal flange, qr qf quadrate ramus quadrate flange, vor vomerine ramus. Scale bar (A–H) = 30 mm.