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Radiate Animals

Radiate Animals. Cnidarians and Ctenophores. Radiates Are Eumetazoans. Radiates. Radial symmetry Tissue level organization Two germ layers Ectoderm and endoderm Nerve net (simple nervous system) Extracellular digestion. Cnidaria. Ctenophore. Radiate Phyla. Phylum Cnidaria. Two forms

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Radiate Animals

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  1. Radiate Animals Cnidarians and Ctenophores

  2. Radiates Are Eumetazoans

  3. Radiates • Radial symmetry • Tissue level organization • Two germ layers • Ectoderm and endoderm • Nerve net (simple nervous system) • Extracellular digestion

  4. Cnidaria Ctenophore Radiate Phyla

  5. Phylum Cnidaria • Two forms • Polyp • Medusa • Tentacles • Nematocyst

  6. Polyp and Medusa Forms

  7. Class Hydrozoa • Mostly colonial • Polyp and medusa life cycle for most • Hydra – non colonial polyp stage only • Obelia – typical colony • Chiton exoskeleton • Extracellular and intercellular digestion

  8. Hydra

  9. Hydra Tissue Structure

  10. Obelia Life Cycle

  11. Gonionemus

  12. Class Scyphozoa • Larger jellyfish • Not colonial • No vellum • Internal gastric pouches • Radial canals lead to ring canal

  13. Aurelia Life Cycle

  14. Medusa

  15. Strobilia

  16. Class Anthozoa • Subclasses • Zoantharia – anemones, hard coral • Alcyonaria – sea fans (soft coral) • Ceriantipatheria – tube anemone, horny coral • Polyp form, no medusa stage • Partitioned gastrovascular cavity

  17. Sea Anemone

  18. Sea Anemone

  19. Anemone Fish (Clown Fish)

  20. Zoantharian Coral • Calcium carbonate exoskeleton secreted externally from base • Contain mutualistic zooxanthallae algae • Live in colonies • Hexamerous symmetry

  21. Coral Polyps

  22. Alcyonarian Coral • Octomerous symmetry • Colonial • Can communicate with members of colony through tubes call solenia • Endoskeleton composed of spicules and protein and secreted within mesoglea

  23. Soft Corals

  24. Phylum Ctenophora • Comb Jellies • Move using cilia • Comb plates • Do not have nematocysts • Colloblasts capture food

  25. Comb Jelly Tentacle

  26. Comb Jelly Structure

  27. Comb Jelly Cilia

  28. Predatory Comb Jellies Approaching Prey

  29. Predatory Comb Jelly Engulfing a Comb Jelly

  30. Comb Jelly After a Meal

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