Question

what is the locomotory organs of echinodermata​

Answer 1

the locomotory organ of echinodermata is called tube feet due to its tube like structure

Answer 2

A unique feature of echinoderms is the water vascular system. It is a complex system of water-containing tubes and bladders which pass through pores in the skeleton. On the outside, these tubes look like feet. These tube feet are used for locomotion, exchange of gases and feeding.