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The posterolateral arms (pl) are directed dorsally. The larva turns dorsally (a clockwise rotation as viewed toward its left side). Numbers at the upper right of the frames are time in seconds. Arrows indicate direction of motion of the posterolateral arms. From 0 through 10 seconds both posterolateral arms stroke. From 11 to 13 seconds the left posterolateral arm moves little while the right posterolateral arm continues strokes.
