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PHYLUM ECHINODERMATA

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CLASS ECHINOIDEA- sand dollar, sea urchin. CLASS HOLOTHUROIDEA- sea cucumber ... Sand dollar. Brittle stars. Feather stars. Why are they important? ... – PowerPoint PPT presentation

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Title: PHYLUM ECHINODERMATA


1
PHYLUM ECHINODERMATA
  • Radial and bilateral stage, but NO HEAD!
  • 2 openings
  • Endoskeleton - internal skeleton
  • Spiny skin
  • Water vascular system
  • Feeds by prying open shells and sending stomach
    outside of body for digestion
  • Some are detritus or filter feeders
  • Respiration - diffusion
  • Moves with use of tube feet
  • Regeneration abilities
  • Open water fertilization

2
Deuterostomes
  • -form anus first (mouth second)
  • -radial cleavage
  • -allows for more complex body structure

3
ECHINODERM CLASSIFICATION
  • 5 Classes (Know the examples)
  • CLASS ASTEROIDEA-starfish
  • CLASS ECHINOIDEA- sand dollar, sea urchin
  • CLASS HOLOTHUROIDEA- sea cucumber
  • CLASS CRINOIDEA- feather stars
  • CLASS OPHIUROIDEA- brittle stars

4
Echinoderms
Sand dollar
Sea cucumber
Starfish
5
Brittle stars
  • Feather stars

6
Why are they important?
  • Control population of other animals
  • Control algae population
  • Problem Can sometimes eat out of control
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