Phylum Cnidaria Hydra, jellyfish, coral, & sea anemones
Phylum Cnidaria Examples? Sea anemones Corals
Sea Pen Sea Fan Sea Plume Hydra
Jelly fish Portuguese Man o War Box Jelly Fish
I. Body Structure A. Polymorphism = more than one body form 1. Polyp
2. Medusa B. Polyp Tube with tentacles
around the mouth Sessile Coral polyp
Polyp (sea anemone) Mythical Hydra
Polyp (Hydra) Perseus slays the Gorgon
Medusa C. Medusa Umbrella shape
Tentacles around mouth Motile, Free-swimming Have
D. Tentacles nematocysts
(stinging cells) Coiled thread discharges
like a harpoon Contains neurotoxin Paralyzes
prey Discharge d
Discharged nematocyst II. Level of Organization
A. Tissue B. No organs
III. Symmetry Radial Compass jellyfish
IV. Habitat A. Aquatic 1. Most Marine
2. Few fresh-water V. Feeding A. Carnivores
Lions mane (predators) eats another B. Process of feeding
jelly 1. Tentacles sting prey with nematocysts 2. Tentacles grab prey
3. Prey pulled into mouth Process of feeding 4. Prey stuffed into gastrovascular cavity (GVC)*
5. GVC makes enzymes, extracellular digestion 6. Undigested food back out mouth *incomplete digestive tract (no
Lions mane jellyfish eating VI. Respiration
Via diffusion Body is two cell layers thick
VII. Internal Transport Via diffusion VIII. Excretion
Via diffusion IX. Response
A. No cephalization or nervous system B. Nerve net around mouth IX. Response
C. Sensory cells 1. Chemoreceptors (chemicals) 2. Thigmoreceptors (touch) 3. Photoreceptors (light)
Ocelli (eyespots) 4. Statocysts (balance) X. Locomotion
A. Medusa motile, free-swimming B. Polyps sessile Exceptions: 1. Hydra tumbles on tentacles
2. Sea anemones glide on pedal disc XI. Reproduction
1. Asexual budding from polyps or medusae 2. Sexual a. Medusae release sperm & eggs
b. Some monoecious, some dioecious c. Larvae free-swimming
XII. 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 - protect coastline E. Symbiosis with other organisms
Class Anthozoa: Sea Anemones
Sea Anemones (with sea urchins) Sea Anemones Clown fish with
sea anemone Clown fish & eggs with sea anemone
Clown fish with sea anemone
Giant Sea Anemone Rosy Sea Anemone
Class Anthozoa: Corals Brain Coral
Coral Colt Coral
Elkhorn Coral Cabbage Coral
Flower Coral Feather Coral
Gorgonian Fan Coral Lamellina Coral
Sun Coral Subergorgia Coral
Soft Coral Sea Pen
Sea Fan Sea Plume
Class Hydrozoa: Green Hydra Hydra
Brown Hydra with buds Brown Hydra eating
Hydra eating Daphnia Hydra eats Daphnia
Class Scyphozoa: True Jellyfish Fried egg
Jellyfish Jellyfish
Red-eyed Jellyfish
Jellyfish Jellyfish
Lions mane Jellyfish
Purple lions mane Upside down Jelly fish
Upside down Jelly fish Sea Nettle
Jelly and diver Giant Jelly off Coast of Japan
Beached Jelly fish Jelly fish Humor
Portuguese Man 0 War (a
Hydrozoan), NOT a true jelly fish
Portuguese Man 0 War Tentacles of Physalia physalis
Portuguese Man o War vs. Box Jelly fish Class Cubozoa: Box Jellyfish
Chironex fleckeri the Box jelly fish
