Phylum Cnidaria Hydra, jellyfish, coral, & sea anemones

Phylum Cnidaria Hydra, jellyfish, coral, & sea anemones

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

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