Hello,

Ambulacral system is just another name of water vascular system which is seen in phylum echinodermata . It is coelomic in origin. A perforated plate called madreporite is present. These pores allow water to enter.

Tube feet another feature of this system which helps in locomotio, capture of food and respiration.

Echinodermata are triploblastic and coelomate with organ system level of organisation.