Question
Write down four general characters of phylum Echinodermata. Give two examples.
✓
Answer
- Simple animals may be a star like, spherical or elongated.
- Body is triploblastic, coelomate, unsegmented and radially symmetrical.
- Body lacks head but has oral and aboral surfaces. Oral surface of the body has five radial areas called ambulacra.
- 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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