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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 • Cell Organization: Cells form into musclelike tissues, no organs or organ systems • Reproduction: Sexual and Asexual • Body Development: Zygote to Larva to Polyp to Adult Cnidarian Anatomy POLYP • SHAPED LIKE A VASE • MOUTH OPENING AT TOP(ONE OPENING) • MOST DO NOT MOVE AROUND (sessile) HYDRA Cnidarian Anatomy MEDUSA • BOWL-SHAPED • FREE SWIMMING • MOUTHS OPEN DOWNWARD SEA JELLY HOW CNIDARIANS FEED The Lion's Mane Jelly is a venomous SEA JELLY which can sting people with its long tentacles • CAPTURES PREY USING STINGING CELLS CALLED NEMATOCYSTS • TENTACLES PULL FOOD INTO ITS MOUTH. • FOOD IS DIGESTED IN ITS CENTRAL CAVITY AND EXPELLED THROUGH ITS MOUTH CNIDARIAN REPRODUCTION SEXUAL ASEXUAL • SOME CARRY BOTH SPERM AND EGG. • SOME ARE EITHER MALE OR FEMALE • BUDDING • SPLITS INTO TWO Throughout its life, the Sea Jelly is found in both a polyp and a medusa form. Sea Jellies • Sea jellies are invading! 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. 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 SEA ANEMONE • These flower-like animals resemble plants, but they have a mouth at the center of their tentacles, and a primitive digestive system The Tealia anemone. Hydra Hydra reproduce by budding • 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