Echinoderms are marine animals with radial symmetry and spiny skin. They include sea stars, sea urchins, sea cucumbers, and brittle stars. Sea stars have tube feet they use for movement and breathing, and have a central disc and arms. Sea urchins use their spines for protection and eat algae. Sea cucumbers have a leathery body and eat sediment from the sea floor.

1. Phyllum Echinodermata
Sand Dollars
Sea urchins Sea stars
(starfish)
Sea cucumbers
Ophiura

2. Echinoderms
• Echinodermata means “spiny skin”.
• Radial symmetry.
• There are more than 5000 species of
Echinoderms.
• They lay eggs that undergo
metamorphosis

3. Echinoderms
Skeleton covered by
skin Dermoskeleton

4. Sea Star Anatomy
Ambulacra tubes and ambulacra feet
http://www.youtube.com/watch?v=HPhAGyDceLo
To move, breathe, circulate water and
eliminate waste

5. Sea Stars- Starfish
• Most starfish have 5 “arms”or rays.
• They have tube feet for locomotion, and
strong suction to hold them in place.
• They breathe through small gills in their
skin.
• Their mouths are located on the
underside of their bodies.
• Starfish can regenerate. (must have the
central disc attached).
• Sea Stars are carnivorous. They eat
mostly shellfish, snails, and barnacles.

6. Sea Urchins
• Sea Urchins look like big pin cushions.
• They use these spines for protection
against predators.
• They eat mostly algae.

7. Sea Urchin Anatomy

8. Sea Cucumbers

9. Sea Cucumber Anatomy

10. http://glencoe.mcgraw-
hill.com/sites/dl/free/0078617022/167348/00038301.swf
http://www.biology4kids.com/extras/quiz
_invertintro/q10_no.html
http://www.quia.com/quiz/122409.html?
AP_rand=1160034079

11. Explain briefly the structure
Other animals in their phylum

12. Explain briefly the structure
Other animals in their class
Classes in its phylum

13. Explain briefly the structure
Other animals in their phylum
3 groups of worms

14. Explain briefly the structure
How do they reproduce?
Important cells in their
bodies

15. Explain briefly the structure
Other animals in their class
Classes in its phylum

16. Explain briefly the structure
Other animals in their class
Classes in its phylum

17. Explain briefly the structure
Other animals in their class
3 groups of worms

18. Explain briefly the structure
Other animals in their class
Classes in its phylum

19. Explain briefly the structure
Other animals in their class
Classes in its phylum

20. Explain briefly the structure
Other animals in their class
Classes in its phylum

21. Explain briefly the structure
Other animals in their phylum
3 groups of worms

22. Explain briefly the structure
Other animals in their class
Classes in its phylum

23. Explain briefly the structure
Other animals in their class
Classes in its phylum