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Phylum Echinodermata

Phylum Echinodermata. Deuterostomia Anus forms from or near blastopore Mouth forms secondarily. Protostomes vs Deuterostomes. Plutei. Echinoderm Development. Metamorphosis of bilaterally symmetric larvae to pentaradial adults. Deuterostome Phylogeny. Echinoderm Phylogeny.

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Phylum Echinodermata

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  1. Phylum Echinodermata • Deuterostomia • Anus forms from or near blastopore • Mouth forms secondarily

  2. Protostomes vs Deuterostomes

  3. Plutei

  4. Echinoderm Development • Metamorphosis of bilaterally symmetric larvae to pentaradial adults

  5. Deuterostome Phylogeny

  6. Echinoderm Phylogeny

  7. Primary bilateral symmetry Larval forms Some adult forms Secondary pentaradial symmetry 5 radial divisions of major organ systems Echinoderm Symmetry

  8. Phylum Echinodermata • Spiny skin • Endoskeleton • Dermal ossicles • CaCO3, Ca2(PO3)2

  9. Pedicellaria

  10. Phylum Echinodermata • Water vascular system

  11. Water Vascular System & Tube Feet

  12. Tube Feet

  13. Hemal Canals

  14. Class Asteroidea • Central body disc • Most frequently 5 arms • Regeneration Starfish & Sea Stars

  15. Asteroidea Anatomy

  16. Asteroidea Anatomy

  17. Regenerating Arms

  18. Commensals of Echinoderms

  19. Class Ophiuroidea Sea baskets Brittle Stars Reduced central disc Reduced tube feet

  20. Class Ophiuroidea Sea baskets Basket stars

  21. Ophiuroidea Anatomy

  22. Ophiuroidea Anatomy

  23. Class Echinoidea Sea urchins Sea biscuits Sand dollars

  24. Echinoid Anatomy

  25. Echinoid Mouth – Aristotle’s Lantern

  26. Class Holothuroidea Sea Cucumbers

  27. Holothuroidea Anatomy

  28. Holothuroidea Defense Reaction • Eversion of the respiratory tree and lower intestine • Some species produce toxins

  29. Class Crinoidea Feather StarsSea Lillies Sessile Crinoids Swimming Crinoid

  30. Crinoid Anatomy

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