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The Fascinating World of Cnidarians: Coral, Hydra, Jellyfish & Anemones

Explore the diverse phylum Cnidaria, including classes such as Coral (Anthozoa), Hydra (Hydrozoa), Jellyfish (Scyphozoa), and Sea Anemones. Learn about their unique body structures, feeding habits, habitats, and ecological roles in marine ecosystems. Discover the symbiotic relationships with other organisms and the importance of coral reefs.

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The Fascinating World of Cnidarians: Coral, Hydra, Jellyfish & Anemones

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  1. Phylum Cnidaria Classes: 1. Coral- Anthozoa 2. Hydra- Hydrozoa 3. Sea Jellies/ Jellyfish- Scyphozoa 4. Sea Anemones- Anthozoa subclass Hexacorallia

  2. Body Structure A. Polymorphism = more than one body form 1. Polyp 2. Medusa

  3. Polyp • Tube with tentacles around the mouth • Sessile • “Juvenile” Form Coral polyp

  4. Polyp (sea anemone)

  5. Medusa • Umbrella shape • Tentacles around mouth • Motile, Free-swimming • “Adult” Form

  6. Tentacles • Have nematocysts (stinging cells) • Coiled thread discharges like a harpoon • Contains neurotoxin • Paralyzes prey Discharged nematocyst

  7. Habitat A. Aquatic 1. Most Marine 2. Few fresh-water

  8. Feeding A. Carnivores (predators) B. Process of feeding 1. Tentacles sting prey with nematocysts 2. Tentacles grab prey 3. Prey pulled into mouth Lion’s mane eats another jelly

  9. Lion’s mane jellyfish

  10. Ecological Role • Predators and prey • Neurotoxins in medical research • Coral – jewelry, building, reefs (surfing!) • Coral reefs - habitat for many -great biodiversity - protect coastline E. Symbiosis with other organisms

  11. Clown fish & eggs with sea anemone

  12. Class Anthozoa: Corals

  13. Class: AnthozoaSubclass Hexacorallia

  14. Class- Hydrazoa

  15. Class Scyphozoa

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