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Phylum Cnidaria

Phylum Cnidaria. Jellyfish, hydra, sea anemones, & coral. Appearance. Polyp : cylindrical, pine shaped animals that are usually attached to a rock or Ex. Hydras, sea anemones, corals Medusa : bell-shaped body; umbrella

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Phylum Cnidaria

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  1. Phylum Cnidaria Jellyfish, hydra, sea anemones, & coral

  2. Appearance • Polyp: cylindrical, pine shaped animals that are usually attached to a rock or Ex. Hydras, sea anemones, corals • Medusa: bell-shaped body; umbrella Ex. Jellyfish *Have 2 tissue layers: ectoderm & endoderm

  3. Appearance (cont.)

  4. Appearance of a jellyfish

  5. Symmetry • Radial symmetry

  6. Skeletal/Muscle System • most have primitive muscle cells; coral have external skeleton of calcium carbonate

  7. Capturing PreyLET’S EAT!!! • cnidarians are carnivores (eat meat) that use tentacles arranged in a ring around their mouth to capture prey • when a “trigger” is stimulated on a stinging cell called the cnidocyte, a harpoon or nematocyst shoots out & injects poison into the prey

  8. Capturing Prey: Cnidocyte and Nematocyst at work: WE DO WORK!!!  Nematocyst (harpoon) Cnidocyte (stinging cell)

  9. Digestion • Sac w/ a digestive cavity (gastrovascular cavity) w/ a single opening that acts as a mouth/anus Jellyfish Hydra

  10. Digestion (cont.) • food is pushed into the gastrovascular cavity where digestion begins (extracellular digestion) • undigested remains leave through the mouth/anus

  11. Nervous System • Nerve Net- Cnidarians do not have a brain but they have simple sensory receptors that detect & respond to stimuli

  12. Circulation • NONE!!

  13. Respiration • Diffusion- oxygen from water moves into sponge cells (high to low)

  14. Reproduction • Asexual – budding- formation of outgrowths that pinch off from parent to live independently • Sexual- forms a zygote and free swimming planula that settles on ocean floor • *MOST ALTERNATE B/W POLYP & MEDUSA LIFE FORM

  15. Reproduction (cont.)

  16. Reproduction (cont.)

  17. Excretion • mouth/anus- release waste

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