Fig. 1. Typical shape of the resting larval body. (A) Silhouettes of lateral and dorsal views of a larva, traced from video images. The tail fin is shown in white. The concave-left bend in the tail of this individual can be seen from the dorsal view. (B) The midline measured from the dorsal view of the same individual. Trunk angle () is the angle between the trunk’s midline and the first anterior segment of the tail. Curvature for a tail segment () is equal to the angular flexion, , between the neighboring segments, divided by the length of the segment, s (Thomas and Finney, 1980).