1. Hydra, jellyfish, coral, & sea anemones
Phylum Cnidaria
Hydra, jellyfish, coral, & sea anemones

2. Phylum Cnidaria Examples? Sea anemones Corals Sea Pen Sea Fan
Sea Plume
Hydra
Jelly fish
Portuguese Man o’ War
Box Jelly Fish

3. Body Structure
1. Polyp
2. Medusa

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

5. Polyp (sea anemone)

6. A Hydra (Polyp shape)

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

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

9. Discharged nematocyst

10. III. Symmetry
Radial
Compass jellyfish

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

12. Feeding A. Carnivores (predators) B. Process of feeding
1. Tentacles sting prey with nematocysts
2. Prey pulled toward mouth
Lion’s Mane eats another jelly

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

14. Lion’s Mane jelly

15. Response
No cephalization or nervous system
Nerve net around mouth

16. X. Reproduction 1. Asexual budding from polyps or medusae 2. Sexual
a. Medusae release sperm & eggs
b. Larvae free-swimming

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

18. Class Anthozoa: Sea Anemones

19. Sea Anemones (with sea urchins)

20. Clown fish with sea anemone

21. Clown fish & eggs with sea anemone

22. Giant Sea Anemone

23. Rosy Sea Anemone

24. Class Anthozoa: Corals

25. Brain Coral

26. Coral

27. Colt Coral

28. Elkhorn Coral

29. Cabbage Coral

30. Flower Coral

31. Feather Coral

32. Gorgonian Fan Coral

33. Lamellina Coral

34. Sun Coral

35. Subergorgia Coral

36. Soft Coral

37. Sea Pen

38. Sea Fan

39. Sea Plume

40. Class Hydrozoa: Green Hydra

41. Hydra

42. Brown Hydra with buds

43. Brown Hydra eating

44. Hydra eating Daphnia

45. Class Scyphozoa: True Jellyfish
Fried egg jelly

46. Jellyfish

47. Jellyfish
Red-eyed medusa

48. Jellyfish

49. Jellyfish

50. Jellyfish
Lion’s mane

51. Jellyfish
Purple lion’s mane

52. Upside down Jelly fish

53. Upside down Jelly fish

54. Sea Nettle

55. Giant Jelly off Coast of Japan

56. Beached Jelly fish

58. Portuguese Man 0’ War (a Hydrozoan), NOT a true jelly fish

59. Portuguese Man 0’ War
Tentacles of Physalia physalis

60. Portuguese Man o’ War vs. Box Jelly fish

61. Class Cubozoa: Box Jellyfish

62. Chironex fleckeri the Box jelly fish