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Phylum Porifera

Learn about the fascinating world of sponges and cnidarians, including their anatomy, feeding habits, and reproduction. Explore the beauty of coral reefs and encounter the mysterious Portuguese Man of War. Watch videos and find images to deepen your understanding of these unique creatures.

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Phylum Porifera

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  1. Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals .....

  2. Don’t forget – sponges are animals and belong to the Animal Kingdom 1. Multicellular 2. No organs or body systems 3 . Cellular digestion (heterotrophic) 4. Asymmetry

  3. Sponges are SESSILE – they do not move They obtain food by FILTER FEEDING

  4. Reproduce sexually (sperm and eggs)Reproduce asexually (regeneration) Skeleton composed of spongin (soft) and spicules (hard)

  5. Sponge Anatomy

  6. Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste

  7. CHOANOCYTES – collar cells · layer of cells with flagella· the movement of the flagella keeps a water current going in the sponge· food vacuoles in the collar cells digest plankton and other small organisms (filter feeder)

  8. Cnidarians  -  jellyfish, coral, hydra, sea anemone *Named after the stinging cells found on their tentacles called CNIDOCYTES

  9. Characteristics of Cnidarians· Tentacles· Cnidocytes (stinging cells)

  10. · Nematocysts (barbs)· Gastrovascular cavity (digestion)

  11. Most Cnidarians have radial symmetry

  12. Cnidarians have two body forms: polyp (vase shaped)               medusa (cup shaped)

  13. Portuguese Man of War - cnidarian that floats in the water and has long tentacles

  14. Video: Jellyfish Scene from Nemo

  15. What kind of symmetry does hydra have? Is it a medusa or a polyp? The Hydra is a freshwater cnidarian we will study in the lab

  16. Video of hydra at http://www.microscopyu.com/moviegallery/pondscum/hydra/

  17. WORD BANK Gastrovascular cavityTentacleCnidocyteEctodermEndodermMesogleaOvary/TesteBudNematocystMouthBasal Disk Hydra Anatomy (printable)

  18. Coral Reefs are made from the skeletons of cnidarians

  19. Multimedia Sponge Images and Videos - http://www.junglewalk.com/video/Sponge-movie.htm Cnidarian Images and Videos - http://www.junglewalk.com/video/Coelantrate-movie.htm General Invertebrate Movies at National Geographic --- really good video on the portuguese man of war (under invertebrates) Hydra Video at  http://www.schooltube.com/video/55045/Hydra

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