Echinoderms

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Echinoderms

  1. 1. Echinoderms “spiny skin”
  2. 2. Echinoderms: Main Characteristics• Spiny Skin – Exoskeleton – Musculoskeletal• 5 part radial symmetry – Penta-radial• Tube feet: Movement – Water-vascular system• Benthic organisms
  3. 3. Classes• Asteroidea: Sea Stars• Ophiuroidea: brittle stars• Echinoidea: sea urchins and sand dollars• Holothuroidea: Sea cucumbers• Crinoidea: Sea Lilies and feather stars
  4. 4. Class Asteroidea: Sea Stars• Aster = star, oides = in the form of• Large Coelome• Circulatory system: – use diffusion & cilia to move gas, nutrients and waste• Respiratory system: – Dermal branchi on skin
  5. 5. Diagram the arm of the starfish
  6. 6. Asteroidea• Digestive System: – Mouth on underside – Opens into cardiac stomach • Folds out of body into prey to secrete enzymes – Opens into the pyloric system • Nutrients diffuse out of the pyloric stomach• Eat: – mollusks, crustacheans, polychaetes, coral, detritus
  7. 7. The Water Vascular System• Who can explain how hydraulics work?• Water Vascular System: – Made up of a series of water-filled canals that run down the arms from a canal ring in the center • Radial canal – ampullae – tubed feet
  8. 8. Water Vascular System
  9. 9. Asteroidea vs. Ophiuroidea• Sea Star vs. Brittle Star• Sea Stars: – Arms attached to arms – Carnivores: Active Predators• Brittle Star – Arms NOT attached to arms – Not active predators: eat plankton
  10. 10. Echinoidea: Sea Urchins• Same structure, longer spines than starfish – Move by means of tube feet• Feeding – Herbivores, feed on algae and marine plants – Grazers – Scrape food using ARISTOTLES LANTERN!• Roles: – Control algae
  11. 11. Sea Cucumbers• Elongated Body Plan – Long sea urchin• Tube feet to move• Separate sexes• Take organic nutrients out of sand – Use oral tentacles• Defense: – release internal organs – Tubules called cuvierian tubules: sticky and poisonous
  12. 12. CFU• What is the etymology of Echinoderm• What is the organ called that extends and contracts echinoderm’s tube feet?• What kind of symmetry are Echinoderms?• What is a major difference between the feeding habits of starfish and sea urchins?• What is the major difference between sea stars and brittle stars• Explain how sea cucumbers defend themselves. Why are they able to do this?

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