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. 2024 Oct 22;14:24864. doi: 10.1038/s41598-024-75389-y

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 8 — Ecological adapations and external morphology of fossil (A‒B) and recent Deuterophlebiidae (C). (A) Cretodeuterophlebia courtneyi sp.nov.; (B) Protodeuterophlebia oosterbroeki sp. nov., both in Burmese amber; (C) Deuterophlebia coloradensis, recent species. Note: complete reduction of mouthparts in all species; reduction of the neck region from (A) to (C); differences in antennae; proportions of wings and body lengths in fossil and recent species; early stages of development of false veins net. Legend: yellow irregular shape symbolises amber; red arrow - reduction of the neck region; green arrow - reduction of mouthparts; white and blue arrows - presence of false veins: white - false veins are scarce; single blue arrow - abundant; double blue arrow -prevailing. Wavy blue lines with splashes symbolize torrent water inhabited by recent deuterophlebiids; waves weaker in shape and colour indicate our supposition on similar habitat in Cretaceous deuterophlebiids. White dashed lines across wings in (C) represent transverse false veins; the possible early stage of this structure is marked in (A).