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Porifera and Cnidarians

Learn about the unique features and feeding/reproduction methods of sponges and cnidarians (jellyfish, sea anemone, coral). Understand their asymmetry, feeding mechanisms, reproduction processes, and support systems.

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Porifera and Cnidarians

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  1. Porifera and Cnidarians

  2. Key Questions • Describe the distinguishing characteristics of sponges and cnidarians. • Describe how sponges and cnidarians feed and reproduce.

  3. Phylum: Porifera (Sponges)

  4. Characteristics: • Asymmetrical: no front, back, left or right • No complex organs • Sessile (attached at base)

  5. Feeding: A. Sponges are filter feedershttp://vimeo.com/40240443

  6. B. Choanocytes: Specialized cells that use flagella to move a steady current of water though the cell. C. The movement of water is the mechanism for feeding, respiration, circulation and excretion.

  7. Support System • Mineral spicules

  8. ReproductionA. Asexual through fragmentation: a piece of sponge can regrow into an adult sponge

  9. B. Sexual through spawning: sperm and egg are release. Form a free swimming zygotehttp://www.youtube.com/watch?v=D9TaVeHCYnk

  10. Cnidarians (jellyfish, sea anemone, hydra, coral)

  11. Characteristics A. Radial Symmetry B. Incomplete gut (has a mouth but no anus) C. Jelly-like

  12. A. Cnidocytes and Nematocyst 1. Cnidocytes are stinging cells that are located along tentacles 2. Nematocyst is a poison-filled, stinger structure that contains a tightly coiled dart

  13. B. Circulation, respiration, and excretion: food and waste are transported throughout the body and out of the body wall through the mouth.

  14. III. Support system A. Hydrostatic skeleton: the water pressure gives the jellyfish its shape

  15. B. Polyp: tentacles up

  16. Medusa: Tentacles down

  17. IV. ReproductionAsexual through buddinghttp://www.youtube.com/watch?v=5gXu-4ABXNA

  18. Sexual through spawninghttp://www.youtube.com/watch?v=oHiVA9J_YIM

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