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Phylum Echinodermata

Phylum Echinodermata. Starfishes, sea urchins, sea cucumbers. Higher Classification Echinodermata. Class Asteroidea – sea stars Class Ophiuroidea – brittle stars Class Echinoidea – sea urchins Class Holothuroidea – sea cucumbers Class Crinoidea – sea feathers. General Characteristics.

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Phylum Echinodermata

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  1. Phylum Echinodermata Starfishes, sea urchins, sea cucumbers

  2. Higher ClassificationEchinodermata • Class Asteroidea – sea stars • Class Ophiuroidea – brittle stars • Class Echinoidea – sea urchins • Class Holothuroidea – sea cucumbers • Class Crinoidea – sea feathers

  3. General Characteristics • Exclusively Marine • Body unsegmented • Adults with pentamerous secondary radial symmetry • Larvae bilaterally symmetrical • With unique water vascular system

  4. Larval Echinoderms showing bilateral symmetry

  5. Water Vascular System

  6. General Characteristics cont. • First phylum with internal skeleton • With dermal calcareous ossicles • Some with spines or spicules • Digestive system complete • Respiration by dermal branchae, tube feet, or respiratory tree • No kidneys • Dioecious • Locomotion by tube feet, and/or arms

  7. External Anatomy

  8. Internal Anatomy

  9. Brittle star anatomy

  10. Anatomy of a Sea Urchin

  11. Aristotle’s Lantern

  12. Sea Urchin Anatomy

  13. Asteroidea

  14. Ophiurodea

  15. Echinoidea

  16. Holothuroidea

  17. Crinoidea

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