Madreporite
Echinoderms have a water vascular system that pumps sea water into their bodies, moving food, waste and oxygen. In most echinoderms, the water enters through the madreporite, a hole in their surface that acts like a valve, and exits through the tube feet, poviding pressure for them to move.
Star Shaped
Brittle Stars
With long arms that can move independently, brittle stars are the fastest of all echinoderms, using their long appendeges to crawl and swim. They are often found in gigantic groups that cover the sea bed, feeding from the waters above and giving way to any passerby.
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Molluscivore
A starfish's diet consists mostly of bivalves, such as mussels and clams. To eat them, a starfishes uses its strong tube feet to pry the shell open, then pushing its stomach out of its mouth to release enzymes to digest the soft parts of the prey before swallowing them.
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Lack of Appendages
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Evisceration
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