in taxon capable of capable of existence ends during locomotion Echinodermata fully formed stage anatomical system water vascular system BTO:0002125 The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then relaxing to allow the feet to retract. Wikipedia:Water_vascular_system UBERON:0008251