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Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
Echinodermata
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Echinodermata

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Transcript

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

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