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Phylum Cnidaria

Phylum Cnidaria. “Stinging” Examples: Jellyfish, coral, anemones, hydra. Traits. Radial symmetry. Traits. 2 cell layers with a gelatin layer in between. Traits. Net-like nervous system. Traits. No brain. Traits. Blind sac (incomplete) digestive system – only one opening. Traits.

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Phylum Cnidaria

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  1. Phylum Cnidaria • “Stinging” • Examples: Jellyfish, coral, anemones, hydra

  2. Traits • Radial symmetry

  3. Traits • 2 cell layers with a gelatin layer in between

  4. Traits • Net-like nervous system

  5. Traits • No brain

  6. Traits • Blind sac (incomplete) digestive system – only one opening

  7. Traits • Nematocysts – stinging cells

  8. Traits • aquatic

  9. Body forms • Polyp – sessile or semisessile, mouth is upward

  10. Body forms • Medusa – free swimming, mouth is downward

  11. Hydra

  12. Hydra structure • Ectoderm – outside layer of cells • Endoderm – inside layer of cells • Mesoglea – middle layer of jelly

  13. Hydra structure • Mouth – entrance to the digestive system, also serves as the anus – when they release wastes, some of the good food is lost also

  14. Brown Hydra eating

  15. Hydra structure • Gastrovascular cavity – digestive cavity

  16. Hydra structure • Tentacles – arm-like structures around the mouth

  17. Hydra structure • Nematocysts – the stinging cells

  18. Hydra structure • Basal disk – attaches the hydra to the substrate

  19. Hydra structure • Gonads – a gamete producing organ (of either sex) • Testes – the male gonad – produces sperm • Ovary – the female gonad – produces eggs

  20. Reproduction • Asexual – through regeneration or budding

  21. Reproduction • Sexual – the testes release sperm into the water, enter the ovaries of another hydra, fertilize the eggs

  22. Reproduction • Hermaphrodite – a monoecious animal – has both sex organs

  23. Jelly fish • Medusa stage is dominant – reproduce sexually; as polyps, they reproduce asexually

  24. Jelly fish life cycle

  25. Jelly fish • Box jelly – has the most dangerous sting to humans

  26. Box Jellyfish

  27. Box Jellyfish • Along with causing excruciating pain for weeks, the animal's venom is capable of stopping the heart or paralyzing the lungs. The venom will also slowly eat away at the skin.

  28. Jellyfish

  29. Jellyfish Red-eyed medusa

  30. Jellyfish

  31. Jellyfish

  32. Jellyfish Lion’s mane

  33. Jellyfish Purple lion’s mane

  34. Crown Jellyfish

  35. Sea Nettle

  36. Jelly and diver

  37. Giant Jelly off Coast of Japan

  38. Beached Jelly fish

  39. Portuguese Man 0’ War NOT a true jelly fish Made of a colony of individual creatures called zooids – each specialized to do a job

  40. Habitat Floats on surface of warm oceans, relies on wind, currents, and tides to move it

  41. Size – sail (floating bladder) is 12” while the tentacles can be 30 to 100 ft long

  42. Don’t get Stung Not usually fatal but can cause shock and really hurt

  43. Anemones and coral • Spend their entire lives as polyps

  44. Giant Sea Anemone

  45. Pink Bubble Tip Anemone

  46. Rosy Sea Anemone

  47. Clown fish with sea anemone

  48. Brain Coral

  49. Coral

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