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Cnidaria

Cnidaria. Hydra, Jellyfish, Coral, & Sea Anemones. Phylum Cnidaria. Some examples of Cnidaria are: Sea anemones and Corals- Anthozoa Hydra- Hydrozoa Jelly fish- Scyphozoa Ctenophores- non stinging Cnidarians: Comb Jelly. Anatomy.

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Cnidaria

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  1. Cnidaria Hydra, Jellyfish, Coral, & Sea Anemones

  2. Phylum Cnidaria Someexamples of Cnidaria are: • Sea anemones and Corals- Anthozoa • Hydra- Hydrozoa • Jelly fish- Scyphozoa • Ctenophores- non stinging Cnidarians: • Comb Jelly

  3. Anatomy A. Polymorphism- Cnidarians have more than one body form: 1. Polyp 2. Medusa

  4. Polyp Form • Tube with tentacles around the mouth • Sessile Coral polyp

  5. Polyp (sea anemone)

  6. Polyp (Hydra)

  7. Medusa Form • Umbrella shape • Tentacles around mouth • Motile, Free-swimming

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

  9. Level of Organization A. Cnidarians have tissues B. No organs C. Most Cnidarians have Radial Symmetry

  10. Radial Symmetry Radial Compass jellyfish

  11. Habitat Aquatic: 1. Most Marine 2. Few fresh-water

  12. 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

  13. Process of feeding 4. Prey stuffed into gastro-vascularcavity (GVC)* 5. GVC makes enzymes, extra-cellular digestion 6. Undigested food back out mouth *incomplete digestive tract (no anus)

  14. Lion’s mane jellyfish eating

  15. Respiration • Via diffusion • Body is two cell layers thick

  16. Internal Transport • Via diffusion

  17. Excretion • Via diffusion

  18. Response • No nervous system • Nerve net around mouth

  19. Locomotion • Medusa- motile, free-swimming • Polyps- sessile,attached to hard substrate Exceptions: 1. Hydra tumbles on tentacles 2. Sea anemones glide on pedal disc

  20. Reproduction 1. Asexual budding 2. Sexual a. Medusae release sperm & eggs b. Larvae are free-swimming

  21. 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

  22. Class Anthozoa: Sea Anemones

  23. Sea Anemones (with sea urchins)

  24. Sea Anemones Clown fish with sea anemone

  25. Clown fish & eggs with sea anemone

  26. Clown fish with sea anemone

  27. Giant Sea Anemone

  28. Rosy Sea Anemone

  29. Class Anthozoa: Corals

  30. Brain Coral

  31. Coral

  32. Colt Coral

  33. Elkhorn Coral

  34. Cabbage Coral

  35. Flower Coral

  36. Feather Coral

  37. Gorgonian Fan Coral

  38. Lamellina Coral

  39. Sun Coral

  40. Subergorgia Coral

  41. Soft Coral

  42. Sea Pen

  43. Sea Fan

  44. Sea Plume

  45. Class Hydrozoa: Green Hydra

  46. Hydra

  47. Brown Hydra with buds

  48. Brown Hydra eating

  49. Hydra eating Daphnia • Hydra eats Daphnia

  50. Class Scyphozoa: True Jellyfish Fried egg jelly

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