Fig. 2. Traces of the landmark dots on the elytra in Chalcophora mariana shown as three projections in the external reference system during opening (open dots) and closing (filled dots). Locked positions are near the zero x value. Traces coincide on their opening and closing courses. Pitch 47°, 33 episodes, 195 frames. Body silhouettes in the top (real image) and middle (mirror image) panels are drawn from still frames, while the silhouette in the bottom (reconstructed) panel is shown with closed elytra.