What are the Characteristics of Phylum Echinoderm?


  1. Echino derms are triploblastic and coleomate animals and have radial Symmetry.
  2. Body has more than two cell layers, tissues and organs.
  3. Body cavity a true coelom.
  4. Most possesses a through gut with an anus.
  5. Body shape highly variable, but with no head.
  6. Nervous system includes a circum-oesophageal ring.
  7. Has a poorly defined open circulatory system.
  8. Possesses a water vascular system, which hydraulically operates the tube feet or feeding tentacles.
  9. Without excretory organs.
  10. Normally possesses a subepidermal system of calcareous plates
  11. Marine and regeneration power development.

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