Write the general characters of the phylum echinodermata.

Explanation

1.The adults are radially symmetrical but the larvae are bilaterally symetrical.
2. They have mesodermal endoskeleton of calcareous ossicles called spines.
3. Water vascular system is present.
4. Tube feet are the organs of locomotion, respiration and capture of food.
5. The digestive systemis complete with mouth on the ventral side and anus on the dorsal side.
6. excretory organ are absent.
7. Open type fo circulatory systemis present.
8. Reproduction is by sexual method.
9. Fertilization is external.
10. Indirect development with bilaterally symmetrical larval forms. e.g., starfish.