Title: Phylum Cnidaria
1Phylum Cnidaria
- Hydra, jellyfish, coral, sea anemones
2Phylum Cnidaria
- Examples?
- Sea anemones
- Corals
- Sea Pen
- Sea Fan
- Sea Plume
- Hydra
- Jelly fish
- Portuguese Man o War
- Box Jelly Fish
3I. Body Structure
- A. Polymorphism
- more than one body form
- 1. Polyp
- 2. Medusa
4B. Polyp
- Tube with tentacles
- around the mouth
- Sessile
Coral polyp
5Polyp (sea anemone)
6Mythical Hydra
7Polyp (Hydra)
8Perseus slays the Gorgon Medusa
9C. Medusa
- Umbrella shape
- Tentacles around mouth
- Motile, Free-swimming
10D. Tentacles
- Have nematocysts
- (stinging
- cells)
- Coiled thread discharges
- like a harpoon
- Contains neurotoxin
- Paralyzes prey
Discharged nematocyst
11Discharged nematocyst
12II. Level of Organization
13III. Symmetry
Radial
Compass jellyfish
14IV. Habitat
- A. Aquatic
- 1. Most Marine
- 2. Few fresh-water
15V. Feeding
- A. Carnivores
- (predators)
- B. Process of feeding
- 1. Tentacles sting prey with
- nematocysts
- 2. Tentacles grab prey
- 3. Prey pulled into mouth
Lions mane eats another jelly
16Process 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)
17Lions mane jellyfish eating
18VI. Respiration
- Via diffusion
- Body is two cell layers
- thick
19VII. Internal Transport
20VIII. Excretion
21IX. Response
- No cephalization or nervous system
- Nerve net around mouth
22IX. Response
- C. Sensory cells
- 1. Chemoreceptors (chemicals)
- 2. Thigmoreceptors (touch)
- 3. Photoreceptors (light)
- Ocelli (eyespots)
- 4. Statocysts (balance)
23X. Locomotion
- Medusa motile, free-swimming
- Polyps sessile
- Exceptions
- 1. Hydra tumbles on tentacles
- 2. Sea anemones glide on pedal disc
24XI. Reproduction
- 1. Asexual
- budding from polyps or medusae
- 2. Sexual
- a. Medusae release sperm eggs
- b. Some monoecious, some dioecious
- c. Larvae free-swimming
25XII. 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
26Class Anthozoa Sea Anemones
27Sea Anemones (with sea urchins)
28Sea Anemones Clown fish with sea anemone
29Clown fish eggs with sea anemone
30Clown fish with sea anemone
31Giant Sea Anemone
32Rosy Sea Anemone
33Class Anthozoa Corals
34Brain Coral
35Coral
36Colt Coral
37Elkhorn Coral
38Cabbage Coral
39Flower Coral
40Feather Coral
41Gorgonian Fan Coral
42Lamellina Coral
43Sun Coral
44Subergorgia Coral
45Soft Coral
46Sea Pen
47Sea Fan
48Sea Plume
49Class Hydrozoa Green Hydra
50Hydra
51Brown Hydra with buds
52Brown Hydra eating
53Hydra eating Daphnia
54Class Scyphozoa True Jellyfish
Fried egg jelly
55Jellyfish
56Jellyfish
Red-eyed medusa
57Jellyfish
58Jellyfish
59Jellyfish
Lions mane
60Jellyfish
Purple lions mane
61Upside down Jelly fish
62Upside down Jelly fish
63Sea Nettle
64Jelly and diver
65Giant Jelly off Coast of Japan
66Beached Jelly fish
67(No Transcript)
68Jelly fish Humor
69Portuguese Man 0 War(a Hydrozoan), NOT a true
jelly fish
70Portuguese Man 0 War
Tentacles of Physalia physalis
71Portuguese Man o War vs. Box Jelly fish
72Class Cubozoa Box Jellyfish
73Chironex fleckerithe Box jelly fish