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Back to Invertebrates

Developed by:Cristian and Ariel


Echinoderms are symmetrical:They are usually in five parts.They are marine animals.They have a skeleton made of hard plates,and often have spines.They are covered by a thin skin.


  • Starfish

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  • Sea urchin

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  • Ofiura star

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More Information:

Echinoderms sometimes pose a health threat to humans. The fine structure of the spines of certain species of sea urchins means that if the spine pierces the flesh, it may break off when an attempt is made to remove it. It may require patience — or the assistance of a physician — to fully remove the remaining piece of spine.