List the features of Phylum Echinodermata.

Phylum Echinodermata (spiny skinned animals)

Main Features :

(i) They are marine and free living.

(ii) They are triploblastic, and have a coelomic cavity.

(iii) Body surface is covered all over by calcareous spines (used as skeleton).

(iv) Body cavity is modified into a water-vascular system which is connected tubefeet for locomotion.

(v) Sexes are separate.

Examples. Asterias (star fish), Echinus (sea urchin), Antedon (feather star) etc.