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Parazoa no true tissues

Learn about the biology, anatomy, and ecological importance of cnidarians including jellyfish, anemones, and corals. Explore their structure, feeding mechanisms, reproduction, and significance in marine ecosystems.

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Parazoa no true tissues

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  1. Radiata Bilateria Eumetazoa Parazoano true tissues Multicellularity

  2. Quiz (champaca) • True or False: Jellyfishes have no nervous system. • What are the 2 stages of the life cycle of jellyfishes? • What is the term used to describe the two-tissue layer that Cnidarians possess? • Give one class under this Phylum • Give ecological significance of Cnidarians.

  3. Phylum cnidariastinging animals Gr. “nettle” cnidocytes with nematocysts previously “Coelenterata” with the Ctenophora (coel + enteron) 10 000 sp. http://farm4.static.flickr.com/3085/2832954307_dc57ebb1a6.jpg, http://news.nationalgeographic.com/news/2006/01/images/060119_jellyfish.jpg, http://www.seasky.org/wallpaper/assets/wallpaper_sea/anemones-1280.jpg, http://www.aquariumdomain.com/images/corals/closedBrainCoral1.jpg

  4. FORM and Functiondimorphic body plan radially-symmetric diploblastic 2-layered body wall (epidermis + gastrodermis) gelatinous mesoglea gastrovascular cavity (GVC) incomplete gut digestive sac with only one opening http://www.reefed.edu.au/__data/assets/image/0005/17987/polypdiagram.gif, http://3.bp.blogspot.com/-GHG4p2wPVPs/TenLrQE0cyI/AAAAAAAAA_s/YZiq_lfYItM/s1600/10a.JPG,

  5. FORM and Function: Feeding predatory extracellular digestion in GVC  intracellular within cells of gastrodermis circulation through diffusion http://arayalacy.files.wordpress.com/2011/11/digesthydra2.jpg, http://www.bio.miami.edu/dana/pix/cnidocyte.gif

  6. FORM and Function: response http://media-3.web.britannica.com/eb-media/35/73335-004-9E50A397.jpg

  7. FORM and Function: movement • Polyps: hydrostatic skeleton • Contractile fibers (not true muscle tissues) + H2O in GVC • Medusas: jet propulsion • Fibers contract  medusa closes  H2O forced out  forward movement

  8. FORM and Function: Reproduction Asexual through budding Sexual through synchronized release of gametes

  9. http://www.aaskolnick.com/hydra3.jpg, http://www.walldesk.net/pdp/1024/17/14/-Sea-Anemone.jpg, http://www1.american.edu/ted/images4/braw3.jpg, http://www.oceanwideimages.com/images/2475/large/box-jellyfish-24M1211-16.jpg

  10. ecology • Coral reefs • budding produces new polyps, new polyps lay down new limestone •  growth rate,  lifespan http://www.cdnn.info/eco/e040701a/e040701a.html

  11. http://i2.cdn.turner.com/cnn/dam/assets/130201123703-01-guardian-0201-horizontal-gallery.jpghttp://i2.cdn.turner.com/cnn/dam/assets/130201123703-01-guardian-0201-horizontal-gallery.jpg

  12. importance • Coral reefs • symbiotic relationships with other plantlike protists • animal habitat • protects land from wave action • tourism • medical research http://www.cdnn.info/eco/e040701a/e040701a.html

  13. importance • Distribution of corals • determined by: • temperature • water depth • light intensity • Problems of corals: • Human activity • Coral bleaching http://ih.constantcontact.com/fs113/1108454596610/img/168.jpg?a=1111854027677 , http://www.breef.org/oldsite/Portals/0/coralmcavbleached%20Sandy%20for%20web.jpg, http://serc.carleton.edu/images/eslabs/corals/coral_bleaching_diagram.gif

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