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Echinoderms

Echinoderms. Sea Star. Sea Cucumber. Brittle Star. Urchin. Sand Dollar (Keyhole Urchin). Video Clip from Blue Planet. Phylum Echinodermata. “Spiny skin” Radial symmetry – 5 parts or multiples of 5 Water vascular system – hydraulic pressure system for movement. Water Vascular System.

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Echinoderms

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  1. Echinoderms

  2. Sea Star

  3. Sea Cucumber

  4. Brittle Star

  5. Urchin

  6. Sand Dollar (Keyhole Urchin)

  7. Video Clip from Blue Planet

  8. Phylum Echinodermata • “Spiny skin” • Radial symmetry – 5 parts or multiples of 5 • Water vascular system – hydraulic pressure system for movement

  9. Water Vascular System

  10. WVS Operation • Water enters through madreporite • Through tube system to ampullae of feet • Muscle contracts - water ejected onto foot – suction • Muscle relaxes – water back into ampullae – no suction

  11. Skeletons • Plates under skin (some fused) or spicules (endoskeleton) • Ca(CO3) – like mollusks • Projections

  12. Sea Stars • Flexible – plates of skeleton with muscles • Ambulacral groove with tube feet • Mouth and anus • Eyespots sense light

  13. Sea Star Feeding • Diet – mollusks, coral • Opens shells with tube feet • Extrudes stomach • Liquefies mollusk

  14. Sea Star Dissection Lab

  15. Brittle Stars • Distinct central disk • Tube feet have no suction – send food to mouth • Arms for locomotion • Mouths with teeth • No anus

  16. Regeneration • Need 1/5 of central disk and 1 arm to regenerate

  17. Sea Urchins • Test • Mouth and anus • Ball and socket spines • Spines and tube feet for movement

  18. Sea Urchins • Algae-eaters and scavengers • Mouth with teeth (Aristotle’s Lantern)

  19. Sand Dollars • Flat sea urchins • Short spines

  20. Sea Cucumber • Elongated body • Small skeletal fragments • Modified tube feet for tentacles on oral end

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