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Meghna Thapar 4 years ago
The marine animals termed echinoderms belonging to Phylum Echinodermata of Kingdom Animalia have spiny bodies.
Characteristics of Echinodermata:
(i) Simple animals may be a star like, spherical or elongate.
(ii) Body triploblastic, coelomate, unsegmented and radially symmetrical.
(iii) Body lacks head but has oral and aboral surfaces. Oral surface of the body has five radial areas called ambulacra.
(iv) Body wall is covered with spiny hard calcareous (calcium carbonate) plates (ossicles) that forms a rigid or flexible endoskeleton.
Example: Echinus (sea urchin) and Asterias (star fish).
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