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Echinoderms

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Echinoderms. Basic Features. Spiny skinned animals Spines project through thin skin Well developed organ systems Water pumping system w/ internal canals Tube feet at ends. Tube Feet. Basic Features. Coelum Radial symmetry Larvae = bilateral Closest vertebrate relative

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basic features
Basic Features
  • Spiny skinned animals
    • Spines project through thin skin
  • Well developed organ systems
  • Water pumping system w/ internal canals
    • Tube feet at ends
basic features1
Basic Features
  • Coelum
  • Radial symmetry
    • Larvae = bilateral
  • Closest vertebrate relative
    • Development similar to chordates (deuterostomes)
    • Endoskeleton
reproduction
Reproduction
  • Sexual
    • Most have separate male/female sexes
    • Gametes released into water
  • Asexual
    • Regeneration: regrowing lost body parts
feeding
Feeding
  • Some filter feed
  • Some active predators
    • Pry open shells using tube feet
    • Stomach releases enzymes to liquify the prey
    • Fluid is sucked up
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