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Jellyfish, Corals, and Sea Anemones

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Presentation on theme: "Jellyfish, Corals, and Sea Anemones"— Presentation transcript:

1 Jellyfish, Corals, and Sea Anemones
Phylum Cnidaria Jellyfish, Corals, and Sea Anemones

2 General Characteristics
Tentacles Hydrostatic skeleton Nerve net Radial symmetry Saclike digestive system (only one opening for mouth/anus) Two layers of cells with mesoglea (jelly-like material) in between. Lack special organs for respiration, excretion, and have no blood

3 Nematocysts (stinging cells) – used for feeding, defense, and some contain toxins.

4 Two Body Forms of Cnidarians
Medusa – free floating, motile, part of the plankton, tentacles and mouth point down Polyp – sessile, part of the benthic community, tentacles and mouth point up.

5 Classes of Cnidarians Hydrozoans Most are colonial
Polyp body form for most of its life cycle Some do not have a medusa stage others do not have a polyp stage, but most have both stages in their life cycle Examples: Portuguese Man-o-War, Hydra

6 Scyphozoans Most are solitary
Medusa body form for most of its life cycle Examples: true jellyfish like the Moon Jelly (Aurelia)

7 Cubozoa Box Jellyfish (Sea Wasp)
The deadliest jellyfish in the world are a type of box jellyfish, with the typical cube body shape Not all species are deadly, but can cause very painful stings

8 Anthozoans Only found in the polyp body form
Reproduce both asexually (budding) and sexually (shed eggs and sperm into the water) Three groups of anthozoans: Anemones – soft fleshy polyps, usually solitary Soft Corals – sea fan and sea whips Hard Corals – which have a calcareous skeleton (usually) and build coral reefs, usually colonial                            

9 Most anthozoans have a symbiotic relationship with a dinoflagellate known as zooxanthellae living in their tentacles that produce food for the coral in exchange for a place to live and nutrients.

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