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Cnidarians

Cnidarians. Coral Sea anemones Jellyfish Distinguishing characteristic – stinging tentacles. Corals. Sea Anemones. Jellyfish. Body Forms. Polyp (coral, anemones) Cylinder, mouth at top Sessile Medusa (jellyfish) Umbrella-shaped Free-swimming. Body Structure.

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Cnidarians

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  1. Cnidarians • Coral • Sea anemones • Jellyfish • Distinguishing characteristic – stinging tentacles

  2. Corals

  3. Sea Anemones

  4. Jellyfish

  5. Body Forms • Polyp (coral, anemones) • Cylinder, mouth at top • Sessile • Medusa (jellyfish) • Umbrella-shaped • Free-swimming

  6. Body Structure • 2 cell layers – ectoderm, endoderm • Mesoglea – middle layer (gel-like) • Gastrovascular cavity

  7. Body Symmetry • Radial • Capture food from all directions

  8. Body Systems • Skeletal • None – hydrostatic pressure • Nervous – nerve net, no brain • Muscular – cells in bands • Jellyfish propulsion

  9. Nerve Net

  10. Stinging Cells (Cnidocytes)

  11. Feeding • Tentacles sting and grasp prey • Into GV cavity via mouth • Enzyme secreted • Digestion completed by cells

  12. Reproduction • Sexual and asexual • Budding • Regeneration

  13. Colonies • Buds don’t break off – animals becomes branched colony

  14. Portuguese Man-of War • Colony – medusae and polyps

  15. Organ Pipe Coral

  16. Deerhorn Coral

  17. Brownstem Coral

  18. Lace Coral

  19. Northern Star Coral

  20. Northern Star Coral

  21. Coral Lab

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