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Phylum Cnidaria

Phylum Cnidaria. Jellyfish. hydra. Coral. Sea Anemone. “True Animals” – Have tissues ( ecto and endo ) & symmetry Most live in salt water; some in fresh water. Cnidaria. Polyp: Cylindrical, pine shaped animals that are usually attached to a rock Ex. Hydra, sea anemones, corals

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Phylum Cnidaria

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  1. Phylum Cnidaria

  2. Jellyfish hydra Coral Sea Anemone

  3. “True Animals” – Have tissues (ecto and endo) & symmetry Most live in salt water; some in fresh water Cnidaria

  4. Polyp: Cylindrical, pine shaped animals that are usually attached to a rock • Ex. Hydra, sea anemones, corals • Medusa: Bell shaped body; umbrella • Ex. Jellyfish Appearance

  5. None! No mesoderm Body cavity?

  6. Most have primitive muscle cells Coral have external skeletons of calcium carbonate Muscular-Skeletal

  7. Sac with a digestive cavity- Gastrovascular Cavity Single opening that acts as a mouth/anus Digestion

  8. Capturing Prey- 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 Food is pushed into the gastrovascular cavity where digestion begins (extracellular digestion) Undigested remains leave through the mouth/anus Digestion

  9. Cnidocyte and nematocyst at work! Jellyfish Video!

  10. Nerve Net – Cnidarians do not have a brain but they have simple sensory receptors that detect & respond to stimuli Nervous Circulation • NONE! Respiration • Diffusion- Cnidarians absorb oxygen through their skin

  11. Asexual – Budding: • Formation of outgrowths that pinch off from parent to live independently Reproduction

  12. Sexual – Forms a zygote & free swimming planula that settles on ocean floor REPRODUCTION

  13. One opening Mouth/Anus – release waste Excretion

  14. Radial! Symmetry

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