Echinoderms
Name_________________________________
Introduction to Echinoderms
1. What are the four classes of Echinoderms?
2. What type of symmetry do all Echinoderms have?
3. What system do Echinoderms use to move their tube feet?
4. What type of symmetry do Echinodem larvae have?
5. How many different ways can you cut an Echinoderm larva and get mirror images?
6. What is an advantage of having radial symmetry?
7. Where can you find Echinoderms?
8. How large can sea stars get?
9. How are brittle stars different from sea stars?
10. In sand dollars, what structure corresponds to the arms of a sea star?
11. What are tube feet used for in sand dollars?
12. Sea urchin shape is described as “globuse.” What shape is this?
13. What structure make up the tentacles of sea cucumbersHow do sea cucumbers feed?
14. Which Echinoderm is the most ancient?
15. Many crinoids are sessile. What does this mean?
Sea Star - External Structure
1. What are the two surfaces of a sea star body?
2. Which side is the mouth located?
3. What Is the function of dermal gills?
4. Where are sensory structures located?
Echinoderms
Name_________________________________
5. What is the function of the madreporite?
6. How does the water vascular system work?
7. How does the tube foot extend?
Sea Star – Internal Structure
1. What is the sea star skeleton made of?
2. What is the function of pedicellariae?
3. What direction do sea star arms move?
4. Which stomach becomes everted during feeding?
5. Does digestion occur inside or outside the body?
6. Do sea stars have internal or external fertilization?