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- Asteroidea - starfish
- Echinoidea - sea urchin, sand dollar
- Holothuroidea - sea cucumber
- Ophiuroidea - brittle star
- Crinoidea - sea lily, feather stars
Madreporite (aka sieve plate)
where water enters WVS
composed of calcareous plates covered epithilium
white and calcareous
- small muscular outgrowths that terminate in calcareous pincers
- remove debris and parasites from surface
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