|Class 9 Biology Diversity In Living Organisms||Echinodermata|
The organism that belongs to this group are spiny skinned organisms.
They are free-existing marine animals.
They are triploblastic.
They have a coelomic cavity.
These organisms use an irregular water-driven cylindrical system for movement.
They have hard calcium carbonate structures which is their skeleton.
Examples of organisms belonging to this group are starfish and sea urchins.