1. THE SPINY – SKINNED ANIMALS Echinodermata

2. Highlights Spines on skin Small phylum (only about 13,000 sp.) Totally aquatic (marine) Radial symmetry

3. Starfish are not the only types of echinoderms.

4. We have four species of echinoderms around Martha’s Vineyard, but there are many more in tropical oceans.

5. We have these two types of starfish: Common Sea Star and the Brittle Star

6. You can also find sand dollars and the green sea urchin in our waters.

7. This is not a real echinoderm. Patrick is pretend.

8. Hydrovascular System The only animals with one. Uses simple water pressure. Tube feet. Echinoderms use it to move and to eat. How?

9. Click on the right images for a short video from a microscopic camera INSIDE the PREY!

10. In the old days, shell-fisherman knew that starfish ate their shell-fish, so they would cut them into pieces whenever they saw them. Why is that a bad idea?

11. This is why.