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. 2021 Apr 22;11:8787. doi: 10.1038/s41598-021-88306-4

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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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(A) Landmark and distance characters used in body-shape analysis. 1, Anterior tip of snout; 2 and 3, anterior and posterior base of the dorsal fin; 4, base of the central caudal lepidotrichium; 5 and 6, posterior and anterior base of the anal fin; 7, base of the pelvic fins; 8, dorsal base of the left pectoral fin; TL, total length. (B) Landmark and distance characters used in heart morphometric analysis. ba, bulbus arteriosus; ven, ventricle; 1, bulbus junction with the first branchial arch; 2, ventricle–bulbus valve; 3, ventricle apex; 4 and 5 landmarks define the widest ventricle depth, perpendicularly to ventricle length (D2–3); D1–2, Bulbus-arteriosus length (BaL); D2–3, Ventricle length (VL); D4–5, maximum ventricle depth (VD), perpendicular to VL.