The water vascular system is a distinctive and highly specialized organ system found exclusively in echinoderms such as starfish, sea urchins, brittle stars, sea cucumbers, and crinoids. It is a hydraulic system derived from the coelom and plays a crucial role in locomotion, feeding, respiration, excretion, and sensory perception. This system is a key adaptive feature that enables echinoderms to survive and function efficiently in marine environments. Structurally, the water vascular system consists of a series of fluid-filled canals lined with ciliated epithelium and connected to numerous tube feet. The system opens to the exterior through a porous structure called the madreporite, usually located on the aboral surface. Seawater enters the system through the madreporite, which also functions as a sieve to filter debris and regulate internal pressure. From the madreporite, water passes into a short calcareous canal known as the stone canal, which descends toward the central ring canal. The ring canal encircles the mouth and serves as the main distributing center of the system. From the ring canal arise