Echinoderms

Echinoderms

1. Groups of Echinoderms

   • Starfish
   • Sea urchin
   • Crinoidea
   • Brittle star
   • Sea cucumber

2. What are they?

   • They are organisms with radial symmetry. They are exclusively marine animals.

3. characteristics

   • They have different shapes: spherical (sea urchins) star-shaped (starfish) and cylindrical (sea cucumbers)
   • Don´t have a defined head.
   • They are oviparous.
   • They have an ambulacral system,which is exclusive to this group.

4. What is an ambulacral system?

   • An ambulacral system is made up of series of tubes filled with liquid that have extensions called ambulacral feet.

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