Extended Data Fig. 4 in A new Jurassic scansoriopterygid and the loss of membranous wings in theropod dinosaurs

Extended Data Fig. 4 | Forelimb comparisons between Ambopteryx and Yi. a, Left forelimb of Ambopteryx (IVPP V24192). b–d, Left forelimb (b), right humerus (c) and the right styliform element (d) of Yi (STM 31-2). The proximal margins of the humeri are marked in white dashed lines to show the differences between these two taxa. Abbreviations as in Figs. 1, 2, except for: st, styliform element. Scale bars, 10 mm (a), 20 mm (b–d).