1. Echinoderms http://www.flickr.com/photos/laszlo-photo/112258325/ http://www.flickr.com/photos/pacificklau s/4027510849/ http://www.flickr.com/photos/kqedquest/3115941447/ http://www.flickr.com/photos/torvaanser/1072597692/

2. Sea Stars http://www.flickr.com/photos/pfly/2474516448/ http://www.flickr.com/photos/zeveroni/109377143/ http://www.flickr.com/photos/gregthebusker/4320800213/

3. Brittle Star Basket Star http://www.flickr.com/photos/dkeats/3082886902/ http://www.flickr.com/photos/rling/2110342314/

4. Sea cucumbers http://www.flickr.com/photos/boogieswithfish/4205285298/ http://www.flickr.com/photos/eclectic-echoes/5004309575/ http://www.flickr.com/photos/thebeest/1356812104/

5. Sea Urchins http://www.flickr.com/photos/kqedquest/3115941447/ http://www.flickr.com/photos/rling/2110342242/

6. Sand Dollars http://www.flickr.com/photos/fiveinchpixie/61176590/

7. What they have in common: Spiny skin! http://www.flickr.com/photos/joe_r/246427851/

8. What they have in common: Symmetry http://www.flickr.com/photos/zen/177383867/

9. What they have in common: Tube Feet http://www.flickr.com/photos/44603071@N00/4 139096209/ http://www.flickr.com/photos/stevecorey/3185972974/

10. Sea Stars http://www.flickr.com/photos/canopic/5895143960/

11. Pin-Cushion http://www.flickr.com/photos/maynard/404485875/

12. Red-nobbed http://www.flickr.com/photos/cybersam/234933965/

13. http://www.flickr.com/photos/28656738@N02/5309178024/ http://www.flickr.com/photos/saspotato/5283483698/

14. http://www.flickr.com/photos/ken-ichi/701239605/

15. Sand Star http://www.flickr.com/photos/rling/2085141072/

16. Crown-of-thorns http://www.flickr.com/photos/freelancer_markcariaga/5828235007/

17. http://www.flickr.com/photo s/joe_r/246427851/ http://www.flickr.com/photos/zen/177383867/ http://www.flickr.com/photos/4460307 1@N00/4139096209/