ECHINODERMS

ECHINODERMS

1. What are Echinoderms like?

   • They come in different shapes: some are spherical(sea urchins), star-shaped(starfish) and cylindrical(sea cucumbers).
   • They do not have a defined head
   • Are oviparus and develop through metamorphosis.
   • They have an ambulacral system, which is exclusive to this group
     • What is an ambulacral system?
       • An ambulacral system is made up of a series of tubes filled with liquid that have extensions called ambulacral feet.
         • Some echinoderms use these feet to catch food or to breath , but the majority of them use them to move about: the feet extend,attach to the floor like suckers and then pull the whole body to make the animal move.

2. Five types of echinoderms:

   • ASTEROIDEA:
   • ECHINOIDEA:
   • OPHIUROIDEA:
   • HOLOTHUROIDEA:
   • CRINOIDEA:

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