Echinodermata

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Echinodermata

  1. 1. Echinodermata
  2. 2. Core Concepts <ul><li>Spiny –skinned animals </li></ul><ul><li>pentaradial symmetry </li></ul><ul><li>Endoskeleton </li></ul><ul><li>water vascular system </li></ul><ul><li>Tube-feet </li></ul>
  3. 3. <ul><li>Bilateral symmetry- larvae </li></ul><ul><li>Deuterostomes </li></ul><ul><li>Water vascular system </li></ul><ul><ul><li>Respiration, circulation, movement </li></ul></ul>
  4. 4. <ul><li>Class Echinoidea (sea urchins, sand dollars) </li></ul><ul><li>Class Ophiuroidea (brittle-stars) </li></ul><ul><li>Class Holothuroidea (sea cucumbers) </li></ul><ul><li>Class Asteroidea (sea stars) </li></ul><ul><li>Class Crinoidea (sea lilies, feather stars) </li></ul>
  5. 5. Keywords <ul><li>Endoskeleton </li></ul><ul><li>Water vascular system </li></ul><ul><li>Nerve ring </li></ul><ul><li>Radial nerves </li></ul><ul><li>Madreporite </li></ul><ul><li>Ring & radial canal </li></ul><ul><li>Tube feet </li></ul>
  6. 6. Echinoderm <ul><li>Echino- spiny; derm- skin </li></ul><ul><li>Endoskeleton- calcareous </li></ul><ul><li>most adults exhibit 5-part radial symmetry </li></ul><ul><li>More closely related to humans than to invertebrates </li></ul><ul><ul><li>Larvae- bilateral symmetry </li></ul></ul><ul><ul><li>deuterostomes </li></ul></ul>
  7. 7. Form and Function <ul><li>Water vascular system </li></ul><ul><ul><li>System of internal tubes filled w/fluid </li></ul></ul><ul><ul><li>For respiration, circulation, movement </li></ul></ul><ul><ul><li>Madreporite- opening to the outside </li></ul></ul><ul><ul><li>Ring canal- ring around the mouth, connects to the madreporite </li></ul></ul><ul><ul><li>Radial canal- extension of ring canal to segments </li></ul></ul><ul><ul><li>Tube feet- suction-cuplike structures </li></ul></ul>
  8. 10. Nutrition <ul><li>Sea urchins: 5-part jawlike structure scrape algae </li></ul><ul><li>Sea lilies: tube-feet capture floating plankton </li></ul><ul><li>Sea cucumbers: bulldozers of the sea </li></ul><ul><li>Sea stars: pry open bivalves w/ tube feet, push stomach through mouth, release enzyme </li></ul>
  9. 11. Respiration and Circulation <ul><li>Water vascular system </li></ul><ul><ul><li>Thin-walled tube feet </li></ul></ul>
  10. 12. Excretion <ul><li>Digestive waste: through anus </li></ul><ul><li>Cellular waste: through tube feet </li></ul><ul><ul><li>How? </li></ul></ul>
  11. 13. Nervous System <ul><li>Nerve ring: surrounds mouth </li></ul><ul><li>Radial nerves: extension from ring </li></ul><ul><li>Sensory cells: detect light, gravity, chemicals </li></ul>
  12. 14. Movement <ul><li>Tube feet + thin layers of muscle attached to endoskeleton </li></ul><ul><li>Mobility determined by endoskeleton </li></ul><ul><ul><li>Sand dollars, sea urchins: w/movable spines </li></ul></ul><ul><ul><li>Sea stars, brittle stars: flexible joint </li></ul></ul><ul><ul><li>Sea cucumbers: tube feet, endoskeleton is reduced </li></ul></ul>
  13. 15. Reproduction <ul><li>External fertilization </li></ul><ul><li>Separate sexes </li></ul>
  14. 16. Class Echinoidea <ul><li>Sea urchins </li></ul><ul><li>Sand dollars </li></ul><ul><ul><li>Large, solid plates that form box around internal organs </li></ul></ul><ul><ul><li>Detrivores, grazers of algae </li></ul></ul><ul><ul><li>Defense: burrowing, spines </li></ul></ul>
  15. 17. Class Ophiuroidea <ul><li>Brittle stars </li></ul><ul><li>Common on reefs </li></ul><ul><li>Slenders, flexible arms w/c can be shed when attacked </li></ul><ul><li>Nocturnal filter feeders, detrivores </li></ul>
  16. 18. Class Holothuroidea <ul><li>Sea cucumber </li></ul><ul><li>Looks like warty, moving pickles </li></ul><ul><li>Detrivores </li></ul><ul><li>Can release gut when attacked (evisceration) </li></ul>
  17. 19. Class Asteroidea <ul><li>Sea stars </li></ul><ul><li>Carnivores </li></ul><ul><li>Can regenerate as long as part contains portion of the central body </li></ul><ul><li>Crown of Thorns </li></ul><ul><ul><li>Acanthaster planci </li></ul></ul><ul><ul><li>Destroys reefs </li></ul></ul>
  18. 20. Class Crinoidea <ul><li>Sea lilies & feather stars </li></ul><ul><li>Filter feeders </li></ul><ul><li>Long, feathery arms </li></ul><ul><li>Oldest class of echinoderms </li></ul><ul><li>Sessile: attached to bottom by long, stemlike stalk </li></ul>
  19. 21. Ecology <ul><li>Determines the population of other marine organisms </li></ul>

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