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

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Presentation on theme: "Cnidaria Cnidaria Hydra, Jellyfish, Coral, & Sea Anemones."— Presentation transcript:

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

2 Phylum Cnidaria Some examples of Cnidaria are: Sea anemones and Corals- Anthozoa Sea anemones and Corals- Anthozoa Hydra- Hydrozoa Hydra- Hydrozoa Jelly fish- Scyphozoa Jelly fish- Scyphozoa Ctenophores- non stinging Cnidarians: Ctenophores- non stinging Cnidarians:  Comb Jelly

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

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

5 Polyp (sea anemone)

6 Polyp (Hydra)

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

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

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

10 Radial Symmetry Compass jellyfish Radial

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 nematocysts 2. Tentacles grab prey 2. Tentacles grab prey 3. Prey pulled into mouth Lion’s mane eats another jelly

13 Process of feeding 4. Prey stuffed into gastro-vascular cavity (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 Respiration Via diffusion Via diffusion Body is two cell layers Body is two cell layers thick thick

16 Internal Transport Internal Transport Via diffusion Via diffusion

17 Excretion

18 Response A. No nervous system B. Nerve net around mouth

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

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

21 Ecological Role A. Predators and prey B. Neurotoxins in medical research C. Coral – jewelry, building, reefs (surfing!) D. Coral reefs - habitat for many -great biodiversity -great biodiversity - protect coastline - 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 Hydra eats Daphnia Hydra eats Daphnia Hydra eats Daphnia

50 Class Scyphozoa: True Jellyfish Fried egg jelly

51 Jellyfish

52 Jellyfish Red-eyed medusa

53 Jellyfish

54 Jellyfish

55 Jellyfish Lion’s mane

56 Jellyfish Purple lion’s mane

57 Upside down Jelly fish

58

59 Sea Nettle

60 Jelly and diver

61 Giant Jelly off Coast of Japan

62 Beached Jelly fish

63

64 Jelly fish Humor

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

66 Portuguese Man 0’ War Tentacles of Physalia physalis

67 Portuguese Man o’ War vs. Box Jelly fish

68 Class Cubozoa: Box Jellyfish

69 Chironex fleckeri the Box jelly fish


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