Schematic drawing of the sandfish's movement in the sand for one half-cycle. Dashed arrows indicate the local movement of the body axis while solid arrows indicate the movement of the limbs. The body axis and the limb direction were extracted from figure 4 and 5 respectively comprising NMR-image 7 to 10 in these figures. The limb direction is indicated however, the feet and the exact attitudes of the feet and toes were not drawn, because it is impossible to determine these data from the NMR-images due to the limited resolution.