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Sand Dollars

Sand Dollars. Sand Dollars : part of the Echinoderm phylum. Closely related to sea urchins Class Echinoidea : sea urchins & sand dollars. Where do they live ? . In the Intertidal Zone of the beach (your best chance at seeing one would be when the tide is at a low level) .

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Sand Dollars

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  1. Sand Dollars

  2. Sand Dollars: part of the Echinoderm phylum • Closely related to sea urchins • Class Echinoidea: sea urchins & sand dollars

  3. Where do they live? • In the Intertidal Zone of the beach (your best chance at seeing one would be when the tide is at a low level)

  4. Why does the petal pattern exist on the sand dollar? • The petal pattern is a set of pores in the endoskeleton through which tube feet can project from the body • Tube feet used to attach (for suction) to hard surfaces and to eat

  5. What do they eat? • Mostly plankton

  6. What preys on sand dollars? • Sea stars • Snails • Skates

  7. When you find a sand dollar on the beach, is it dead or alive? • If it looks like this, dead!

  8. When sand dollars are alive, they look like this…

  9. Sand dollars have DARK spines that look almost like fur. For what are these used? • 1) movement • 2) camouflage

  10. Sand Dollars • 1) aboral surface: the outside or top of a sand dollar • 2) oral surface: the bottom of the sand dollar where the mouth is

  11. Sand dollar structure and movement: • https://www.youtube.com/watch?v=O3uKWy5Vljs

  12. How do they eat? • Use cilia to capture small food particles • Use tube feet to capture large food particles

  13. Did you know? • Sand dollars purposefully consume sand with their food to add weight to their body to help stabilize themselves in the water!

  14. The Aristotle’s Lantern(tooth-like structure) looks like a star!

  15. Did you know? • The Legend of the Sand Dollar: • It is said that Christ left the sand dollar as a symbol of his faith: 5 holes commemorate the 5 wounds of Christ • https://www.youtube.com/watch?v=gLK71-vsi2E

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