Characteristics of Echinoderms

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here are following characteristics of echinoderms.

1. Echinoderms have spiny skin. 2. They are triploblastic animals and are coelomate. 3. In embryonic or larval condition the symmetry is bilateral symmetry, while in adult condition the symmetry is pentaradial symmetry. 4. Some echinoderms have an endoskeleton beneath the skin. Mostly have exoskeleton which is calcareous. 5. Echinoderms are deutrostomes. They have mouth at ventral-oral side. They have anus at dorsal-aboral side. 6. Sieve like plates are present trough which water enters in the body called madreporite. 7. They lack body segmentation. 8. They are aquatic (totally marine). 9. Water-vascular system used in locomotion, attachment or feeding. 10. They have extracellular digestion and one way digestion tube. 11. They have external fertilization. 12. They have sexual reproduction. 13. Some of them can regenerate their body parts or body from a part (a sexual). 14. They have three germ layers. 15. They have open circulatory system have no vessels. 16. Nervous system consist of nerve net, nerve ring and radial nerves. 17. Respiration takes place by diffusion. 18. This is the first group to have true endoskeleton.

Document settings & composed by: Muhammad Akif Ayaz Email: [email protected] Ph# 03048897872 Bs. ZOOLOGY Department of ZOOLOGY Govt. S.E College BWP

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