1. Echinoderms

2. Sea Star

3. Sea Cucumber

4. Brittle Star

5. Urchin

6. Sand Dollar (Keyhole Urchin)

7. Video Clip from Blue Planet https://www.youtube.com/ watch?v=r4cX2EPt2zE Finger of Death

8. Phylum Echinodermata “Spiny skin” Radial symmetry – 5 parts or multiples of 5 Water vascular system – hydraulic pressure system for movement

9. Water Vascular System

10. WVS Operation Water enters through madreporite Through tube system to ampullae of feet Muscle contracts - water ejected onto foot – suction Muscle relaxes – water back into ampullae – no suction

11. Skeletons Plates under skin (some fused) or spicules (endoskeleton) Ca(CO 3 ) – like mollusks Projections

12. Sea Stars Flexible – plates of skeleton with muscles Ambulacral groove with tube feet Mouth and anus Eyespots sense light

13. Sea Star Feeding Diet – mollusks, coral Opens shells with tube feet Extrudes stomach Liquefies mollusk

15. Brittle Stars Distinct central disk Tube feet have no suction – send food to mouth Arms for locomotion Mouths with teeth No anus

16. Regeneration Need 1/5 of central disk and 1 arm to regenerate

17. Sea Urchins Test Mouth and anus Ball and socket spines Spines and tube feet for movement

18. Sea Urchins Algae-eaters and scavengers Mouth with teeth (Aristotle’s Lantern)

19. Sand Dollars Flat sea urchins Short spines

20. Sea Cucumber Elongated body Small skeletal fragments Modified tube feet for tentacles on oral end