Question
List the features of Phylum Echinodermata.
Solution
Phylum Echinodermata (spiny skinned animals)
Main Features are as follows:
(i) They are marine and free living.
(ii) They are triploblastic, and have a coelomic cavity.
(iii) Body surface is covered all over by spines
(iv) Body cavity is modified into a water-vascular system and has a peculiar water-driven tube system which is connected tubefeet for locomotion.
(v) Sexes are separate.
(vi) They have hard calcareous structures that is used as a skeleton.
Examples. Asterias (star fish), Echinus (sea urchin), Antedon (feather star) etc.
A Antedon
B. Holothuria
C. Starfish
D. Ophioderma
E. Echinus
