Fig. 2. (A) Right lateral and dorsal views of wingtip displacement relative to the wing base for Clione antarctica (individual no. 1) swimming at 0.3°C. (B) Wingtip position vs time for two wingbeat cycles. Circles represent the position of digitized data points, and plotted lines are spline functions fitted to time series data. P, posterior; A, anterior; D, dorsal; V, ventral; R, right; L, left.