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Cnidaria (jellyfish/squishy and corals and anemones)

Cnidaria (jellyfish/squishy and corals and anemones). Matthew, Dohn , Tuckah. Cnidaria!!!!. Includes hydras, corals, jellies, and anenomes All have cnidocytes. http://z.about.com/d/animals/1/0/J/U/cnidarian1.jpg. Tucker Chambers.

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Cnidaria (jellyfish/squishy and corals and anemones)

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  1. Cnidaria(jellyfish/squishy and corals and anemones) Matthew, Dohn, Tuckah

  2. Cnidaria!!!! • Includes hydras, corals, jellies, and anenomes • All have cnidocytes http://z.about.com/d/animals/1/0/J/U/cnidarian1.jpg Tucker Chambers http://www.wrobelphoto.com/GelatinousZooplankton/Hydromedusae/Popup189.jpg

  3. Some quick basics • are sessile or floating • Have two forms—polyp and medusa http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/cnidariaDiagram.jpeg Tucker Chambers

  4. Scyphozoans • Jellies • Live mostly as medusae http://www.afrmc.org/images/jellyfish.jpg Tucker Chambers http://lesleehorner.files.wordpress.com/2009/12/jellyfish2.jpg

  5. Anthozoans • Sea anemones and coral • Live only as polyps (sessile) http://library.thinkquest.org/07aug/01713/images/Brain_coral.jpg http://library.thinkquest.org/05aug/01819/Images/Sea%20Anemone.jpg http://www.treehugger.com/dying-coral-frozen.jpg Tucker Chambers http://epaper.kek.jp/f05/PHOTOS/5_TOURS/5_004.JPG

  6. Hydrozoans • Very simple • Found in fresh water • Alternate between polyp and medusa stage http://www.ucmp.berkeley.edu/cnidaria/hydra1.gif Tucker Chambers http://library.thinkquest.org/26153/marine/sketch/600.jpg

  7. Cubazoan's • “Box Jellies” or “Sea Wasps” • Have complex eyes along edge of medusae http://www.zoologie-online.de/Systematik/Metazoa/Cnidaria/Cubozoa/Carybdea.jpg Tucker Chambers http://www.jyi.org/articleimages/189/originals/img0.jpg

  8. Body Cavity • Acoelomates Tucker Chambers http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/cnidariaDiagram.jpeg

  9. Body Symmetry • Radial Symmetry Tucker Chambers http://www.dnr.sc.gov/marine/pub/seascience/images/undrview.gif

  10. Circulatory System • None!  Dory: I spy something pink and squishy that lacks a circulatory system! Marlin: Let me guess… a Cnidarian! http://www.the-reel-mccoy.com/movies/2003/images/FindingNemo3.jpg Matt Maneval

  11. Digestive System • Digestive or gastrovascular cavity open at one end. • Captures animals with nematocysts on tentacles. http://www.advancedaquarist.com/2007/2/fish_album/polyp.jpg Matt Maneval

  12. Excretory System • None. Dory: They don’t have excretory systems? Gross. Marlin: That’s just wrong. http://www.bfi.org.uk/features/ultimatefilm/chart/images/185/56_finding_nemo.jpg Matt Maneval

  13. Locomotion/Musculature • Medusaeswimbyundulations of thebell body. • Polyps are sessile. http://www.infoplease.com/images/ESCI294CNIDAR007.jpg Matt Maneval

  14. Hydrozans reproduce sexually in poor conditions by making resistant zygotes that remain dormant until conditions improve. Reproductive Cycles • Hydrozans reproduce asexually by budding, the pinching off of outgrowths, when conditions are favorable. Dan McKinney

  15. A Box Jellyfish http://www.ntnews.com.au/article/2008/12/13/21641_ntnews.html Sensory Structures • Most Cnidaria have simple sensory structues distributed throughout their bodies. • Some, such as Cubazoans, have complex eyes embedded on the tips of their tentacles for catching prey. Dan McKinney

  16. Skeletal System • Cnidaria's lack bone structure. Most are supported by water swelling in their digestive cavity or water filled cells. • Coral secretes calcium carbonate exoskeletons, which when dead form coral reefs. http://www.bloodydecks.com/forums/northern-california-inshore-offshore-reports/147737-ft-bragg.html

  17. Gas Exchange • Cnidarian species exchange gas through simple diffusion in and out of the cells. Dan McKinney http://www.aloha.com/~lifeguards/chironexfleckeri.jpg

  18. Special “Powers” • Cnidarians use poisonous tentacles to capture and kill their prey. These are called nematocysts. • The Box Jelly Fish is so poisonous that one sting has enough venom to kill 60 men. http://lifeinthefastlane.com/2008/12/box-jellyfish-chironex-fleckeri/ Dan McKinney

  19. Question 1 • Do hydrozoans spend most of their life in • Polyp • Medusa • Alternate between life cycles Matt Maneval

  20. Correct Answer: C. Hydrozoans alternate between polyp and medusa throughout their life. Matt Maneval

  21. Question 2 • How do hydrozoans reproduce? • Sexually • Asexually • Sexually and Asexually, depending on conditions. Matt Maneval

  22. Correct Answer: C. Hydrozoans reproduce sexually and asexually, depending on the conditions. Matt Maneval http://animaldiversity.ummz.umich.edu/site/resources/Grzimek_inverts/Hydrozoa/v01_id118_con_hydanat.jpg/medium.jpg

  23. Question 3 • What classification do Sea Anemones fall under? • Anthozoans • Scyphozoans • Hydrozoans • Cubozoans Dan McKinney

  24. Correct Answer: A, Anthozoans Matt Maneval

  25. Question 4 Which of these are only sessile? • Anthozoans • Hydrozoans • Scyphozoans • Cubozoans Dan McKinney

  26. Correct Answer: A, Anthozoans are only sessile. http://www.anthozoa.com/Photos/Welcome/Anthozoans.jpg Dan McKinney

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