[[1]] is a specialized system found in echinoderms that helps in the movement and locomotion of the animal and in the transportation of food and other substances in the body.

Water vascular system is a unique characteristic of echinoderms that helps in locomotion, the capture of food, and respiration. The water vascular system is a network of fluid-filled canals and structures that are used for a variety of functions, including movement, feeding, and gas exchange. Water is drawn into the system through a sieve-like structure called the madreporite, and it is then circulated through the canals and into the tube feet, which are used for movement and feeding. The water vascular system is an essential part of echinoderm anatomy and plays a key role in their survival and adaptation to their environment.