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Echinodermata

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  • 1. Nikki & Portia Echinodermata Ophioderma rubicundum Brittle Star
  • 2. Classification of animal in Phylum
    • five well-defined clases:
    • Crinoidea (sea lilies and feather stars),
    • Ophiuroidea (basket stars and brittle stars)
    • Asteroidea (starfishes)
    • Echinoidea (sea urchins, sand dollars, and sea biscuits)
    • and Holothuroidea (sea cucumbers).
  • 3. Body form
    • Spiny-skinned
    • Or wart-like bumps
    • symmetrical
    • Can loose up to 3 limbs
  • 4. Reproduction
    • Echinoderms have the ability to regenerate new parts asexually.
    • They also have separate sexes with reproductive organs in each arm.
    • Sexual reproduction involves releasing gametes into the water (external fertilization).
    • Seahorses: males give birth
  • 5. Digestive System
    • Urchins are herbivores (they eat plants)
    • starfish are predators and scavengers
    • other feed on waste.
  • 6. Respiratory System
    • Gills on the skin which exchange gases
  • 7. Living Environment
    • Mainly marine environment
    • Live in slightly salty water
    • Live in shallow and deep waters.
  • 8. Circulatory System
    • Open circulatory system
    • Cilia circulates fluids through the arms.
  • 9. Interaction with humans
    • They are more related to humans than any other invertebrate.
  • 10. Unique Features
    • External skeletons
    • There is no head
    • Usually have mouth on the underside
    • Anus usually on top
  • 11. Pictures!! Sea Urchin Sea Cucumber Basket Star
  • 12. Citing
    •  
    • Various Authors. Think Quest . May 21, 2009.
    • <http://library.thinkquest.org/28751/review/animals/7.html>