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Phylum Cnidaria

Phylum Cnidaria. Pages 307-311. CNIDARIANS- “STINGING CELLS”. SEA JELLIES SEA ANEMONES CORALS HYDRA. Just the facts…. CARNIVORES STINGING CELLS CALLED NEMATOCYSTS HOLLOW CENTRAL CAVITY. Body Characteristics. Body Symmetry: Radial

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Phylum Cnidaria

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  1. Phylum Cnidaria Pages 307-311

  2. CNIDARIANS-“STINGING CELLS” • SEA JELLIES • SEA ANEMONES • CORALS • HYDRA

  3. Just the facts… • CARNIVORES • STINGING CELLS CALLED NEMATOCYSTS • HOLLOW CENTRAL CAVITY

  4. Body Characteristics • Body Symmetry: Radial • Cell Organization: Cells form into muscle-like tissues, no organs or organ systems • Reproduction: Sexual and Asexual • Body Development: Zygote to Larva to Polyp to Adult

  5. Cnidarian Anatomy POLYP • SHAPED LIKE A VASE • MOUTH OPENING AT TOP(ONE OPENING) • MOST DO NOT MOVE AROUND (sessile) HYDRA

  6. Cnidarian Anatomy MEDUSA • BOWL-SHAPED • FREE SWIMMING • MOUTHS OPEN DOWNWARD SEA JELLY

  7. HOW CNIDARIANS FEED • CAPTURES PREY USING STINGING CELLS CALLED NEMATOCYSTS • TENTACLES PULL FOOD INTO ITS MOUTH. • FOOD IS DIGESTED IN ITS CENTRALCAVITY AND EXPELLED THROUGH ITS MOUTH The Lion's Mane Jelly is a venomous SEA JELLY which can sting people with its long tentacles

  8. CNIDARIAN REPRODUCTION SEXUAL • SOME CARRY BOTH SPERM AND EGG. • SOME ARE EITHER MALE OR FEMALE ASEXUAL • BUDDING • SPLITS INTO TWO

  9. Throughout its life, the Sea Jelly is found in both a polyp and a medusa form.

  10. Sea Jellies • Sea jellies are invading!

  11. CORAL • A coral colony consists of hundreds or thousands of tiny polyps. Each polyp is an individual animal (basically a small anemone) but they live together as a group.

  12. Coral Reefs • Reefs are made when coral attaches itself to the ocean floor. • When it dies its hard skeleton is left behind. • The skeletons build up and form large masses. Australia's Great Barrier Reef

  13. SEA ANEMONE • These flower-like animals resemble plants, but they have a mouthat the center of their tentacles, and a primitive digestive system The Tealia anemone.

  14. Hydra • 3-8mm in length • Live in fresh water • Live in both body structures throughout their life • Polyp • Medusa • Mouth surrounded by tentacles • If disturbed, a barbed thread and poison is ejected from the nematocyst Hydra reproduce by budding

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