phylum cnidaria hydra, jellyfish, coral, & sea anemones

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  • Phylum CnidariaHydra, jellyfish, coral, & sea anemones

  • Phylum CnidariaExamples?Sea anemonesCoralsSea PenSea FanSea PlumeHydraJelly fishPortuguese Man o WarBox Jelly Fish

  • I. Body StructureA. Polymorphism = more than one body form

    1. Polyp

    2. Medusa

  • B. PolypTube with tentacles around the mouthSessileCoral polyp

  • Polyp (sea anemone)

  • Mythical Hydra

  • Polyp (Hydra)

  • Perseus slays the Gorgon Medusa

  • C. MedusaUmbrella shapeTentacles around mouthMotile, Free-swimming

  • D. TentaclesHave nematocysts (stinging cells)Coiled thread discharges like a harpoonContains neurotoxinParalyzes preyDischarged nematocyst

  • Discharged nematocyst

  • II. Level of OrganizationA. Tissue

    B. No organs

  • III. SymmetryCompass jellyfishRadial

  • IV. HabitatA. Aquatic1. Most Marine

    2. Few fresh-water

  • V. FeedingA. Carnivores (predators)B. Process of feeding1. Tentacles sting prey with nematocysts 2. Tentacles grab prey3. Prey pulled into mouth

    Lions mane eats another jelly

  • Process of feeding

    4. Prey stuffed into gastro-vascular cavity (GVC)*5. GVC makes enzymes, extra-cellular digestion6. Undigested food back out mouth*incomplete digestive tract (no anus)

  • Lions mane jellyfish eating

  • VI. RespirationVia diffusion Body is two cell layers thick

  • VII. Internal TransportVia diffusion

  • VIII. ExcretionVia diffusion

  • IX. ResponseNo cephalization or nervous systemNerve net around mouth

  • IX. ResponseC. Sensory cells1. Chemoreceptors (chemicals)2. Thigmoreceptors (touch)3. Photoreceptors (light)Ocelli (eyespots)4. Statocysts (balance)

  • X. LocomotionMedusa motile, free-swimmingPolyps sessileExceptions: 1. Hydra tumbles on tentacles 2. Sea anemones glide on pedal disc

  • XI. Reproduction

    1. Asexual budding from polyps or medusae2. Sexuala. Medusae release sperm & eggs b. Some monoecious, some dioecious c. Larvae free-swimming

  • XII. Ecological RolePredators and preyNeurotoxins in medical researchCoral jewelry, building, reefs (surfing!)Coral reefs - habitat for many -great biodiversity - protect coastlineE. 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 DaphniaHydra eats Daphnia

  • Class Scyphozoa: True JellyfishFried egg jelly

  • Jellyfish

  • JellyfishRed-eyed medusa

  • Jellyfish

  • Jellyfish

  • JellyfishLions mane

  • JellyfishPurple 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 WarTentacles of Physalia physalis

  • Portuguese Man o War vs. Box Jelly fish

  • Class Cubozoa: Box Jellyfish

  • Chironex fleckerithe Box jelly fish


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