Movie 1.

Part1: Rapid manoeuvre of a fan worm (Annelida: Sabellidae). Part2: Visualization of body protraction and retraction in a clear tube. Part3: Response of a tentacle separated from worm body to mechanical stimulation. Part4: High-speed films of pinnules flattening in advance of body retraction. Part5: Visualization of deformable bodily ridges of a fan worm. Part6: Movement of a fan worm with chaetal bundles amputated