Movie 3.

Saddle-like regions in the juvenile snapping shrimp claw recoil during dactyl rotation. Movie shows a dorsal view of a snapping shrimp propodus during a high speed strike. Rotation of the dactyl begins at 00:01″ with complete closure at 00:01″. A cavitation bubble is formed and moves off screen to the left. As the dactyl rotates, the saddle like regions on the propodus (shown in Fig. 1) extend slightly. The deformation in the cuticle suggests the saddles may be a region for elastic energy storage. Movie was filmed at 100,000 frames s^-1, played back at 30 frames s^-1.