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Introduction to Echinoderms

Introduction to Echinoderms. 5 th Grade. What are basic characteristics of an Echinoderm? . Invertebrate ENDO skeleton (Internal skeleton) Water vascular system : a system of fluid filled tubes Radial symmetry Tube Feet. Echinoderms: .

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Introduction to Echinoderms

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  1. Introduction to Echinoderms 5th Grade

  2. What are basic characteristics of an Echinoderm? • Invertebrate • ENDOskeleton (Internal skeleton) • Water vascular system: a system of fluid filled tubes • Radial symmetry • Tube Feet

  3. Echinoderms: • http://shapeoflife.org/video/animation/echinoderm-animation-sea-star-body-plan

  4. Belong to the phylum “Echinodermata,” meaning “hedgehog skin”

  5. Where do they live? • ALL live in salt water

  6. ENDOskeleton • An INTERNAL skeleton made of hardened plates with skin stretched over it

  7. Radial Symmetry

  8. Tube Feet

  9. Tube Feet • Stick out from the echinoderm’s sides or underside • Act like small, sticky suction cups • Suction is used for gripping the surface beneath the echinoderm • Use their tube feed to move slowly and capture food

  10. How many species? • More than 5000

  11. Name 4 types of Echinoderms. Bonus: Think of a 5th! • Sea stars • Brittle stars • Sea urchins • Sea cucumber • Sand dollars!

  12. Common Questions: Where is a sea star’s mouth? How does it breathe? • Mouth is located on the underside of its body in the center • Breathe through small gills in their skin

  13. Fun fact: If the central disc is still attached, sea stars can regenerate!

  14. Sea Star Anatomy

  15. Brittle Stars

  16. Brittle Stars • Unlike a sea star’s arms, a brittle star’s arms are long and slim, with flexible joints • Tube feet have no suction cups. They are used for catching food but not moving • Move in a snake-like motion

  17. How Brittle Stars move • https://www.youtube.com/watch?v=KaJ0wqlo3i4

  18. Sea Urchin • No arms • Moveable spine protects body (think of a pin cushion!) • Use bands of tube feet that extend out between the spines • Have teeth-like structures used to scrape & cut food

  19. Sea Urchins: http://www.diverosa.com/categories/Urchins.htm

  20. Look for the Sea Urchin teeth! • https://www.youtube.com/watch?v=Agmlmb_9s2Y

  21. Sea Cucumbers

  22. Sea Cucumbers • Can be red, brown, blue, or green • Leather-like skin • Soft, flexible, muscular bodies • Tube feet that allow them to crawl slowly along the ocean floor • Mouth is surrounded by tentacles –filter feeders! • Sea cucumber eating:https://www.youtube.com/watch?v=420IdYKfi7A

  23. Sea Cucumber Anatomy

  24. Sea Cucumber Fun Facts • Can throw our their intestines as a defense mechanism and then regenerate them • Some can be poisonous! • They stick tentacles into their mouths and lick them off, the way you might lick your fingers!

  25. Sand Dollars • Found in the Intertidal Zone of the ocean • https://www.youtube.com/watch?v=ykoYhCmiaH0

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