Fundamentals of Biology II

Lecture Review Notes

Animal Kingdom (Heterotrophic, Multicellular)

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Water Flea
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Lecture Review #24 Echinoderms

Animal Way of Life -Eucoelomates, Deuterosome
  1. Echinoderm Chordate Line
    1. Radial Cleavage,
    2. Indeterminate Cleavage
    3. Enterocoelomate formation

  2. Phylum Echinoderms [Spiny Skin]
    1. Characteristics:
      1. Radial symmetry (adults), Pentamerous, 5 arms
      2. Metamorphosis from Larva to Adult
      3. Bilateral larvae
      4. Water vascular system with Tube Feet
        [Madraporite, Stone canal. Ring Canal, Radial Canals]
      5. Endoskeleton, discrete ossicles, single calcite crystals
      6. No definite Head, Ganglia in ring
      7. All marine
      8. All Non parasitic, free living, Non colonial
      9. Sexes separate, usually external fertilization
      10. Circulation - no special system
      11. Excretion - no special system
      12. Respiration - no special system,Dermal gills (this walled papulae)

    2. Classes of Echinoderms

      1. Class Crinoidia [Sea Lilies, feather stars]
        1. Series of Arms with pinnules (reproductive structures)
        2. Food caught by cilia in grooves, mucus, moved to mouth

      2. Class Asteroidea [Sea stars, star fish!]
        1. "Star fish" sea stars anistarfish.gif - 4.2 K
        2. Most primitive class
        3. Madraporite sieve plate of water vascular system, external
        4. Gonads and gut Extend into arms
        5. Open Ambulacral Groove

      3. Class Ophiurodia [Brittle stars, Basket stars]
        1. Central disk with long arms
        2. Gonads and gut confined to disk
        3. No Open Ambulacral Groove, Tube Feet through pores
        4. No anus (in & out through mouth)

      4. Class Echinoidea [Sea urchins]
        1. Rigid, globular test, plates of calcite crystals
        2. Mouth, extended gut & anus
        3. Gonopores on dorsal surface
        4. Sea urchins, Used extensively in Embryology
          visit Epel Sea Urchin site
          Check out "Web Projects"

      5. Class Holothuria [Sea cucumbers]
        1. Long Leathery Body, Feeding Tentacles around the Mouth
        2. Mouth and Anus
        3. Body wall soft with many tiny, microscopic spicules
        4. Madraporite internal


    Review Quiz Questions available for - #24 Echinoderms

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    Lecture Review Notes

    To return to: Sister Irma Kessler's page

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