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Fig. 2. Trail produced by the wake of a continuously swimming mayfly larva. The
larva is swimming on its side just above the bottom layer of milk and is
viewed from above. It is pursuing a slightly curved path from top left to
bottom right. (a) The initial trace consists of a sinuous line coinciding with
the motion of the tail fin. (b) The appearance of a fully formed trail 0.5 s
after the events shown in a. Profiles of the larva are shown at successive 40
ms intervals. The mature trail consists of a ladder-like series of areas, each
corresponding to a half-stroke, in which the general motion (as indicted by
the arrows) of the dye is nearly at right angles to the swimming line.
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