Fig. 1. Kinematics of a simple flex manoeuvre in larva of Enallagma cyathigerum. (A) Successive 20 ms profiles seen from above as the larva reacts to a stimulus presented to the left anterior side of the body. (B) Angle of attack of the apical segment of the tail fin, represented by bars, during a simple flex manoeuvre. (C) Superimposed line representations of the longitudinal body axis corresponding to profiles in panel A. Open circles represent the head, crosses represent the centre of the body. In panels B and C, broken lines represent the motion of the head and tail ends of the body.

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