Made this with time lapse machine made from movie projector and remote control.Locomotion is accomplished by a wave-like movement that progresses
over the pedal disc in the direction of locomotion. In a specimen of
Sagartia with a pedal disc of about 4 mm. diameter, the locomotor wave
coursed over the disc 'in an average time of 1.65 minutes and with each
wave the animal progressed on the average 1.2 mm.
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