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Cnidaria

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Cnidaria

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  1. Cnidaria By Chika Hirai Michelle Kao MakanaKrulce http://soe.ucdavis.edu/ss0708/pimentela/images/Jellyfish.jpg

  2. CHIKA Background Information • Divided into 4 classes: • Hydrozoa • Obelia • Some are Freshwater • Scyphozoa • Jellyfish • Cubozoa • Sea Wasp • Anthozoa • Sea Anemones http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/Content/transparent-jellyfish-689547-xl.jpg

  3. Michelle Medusa and Polyps • Polyps: • Cylindrical Form • Adhere to the ground on the aboral end • Not free moving • Medusa: • Flattened, mouth down version of polyp • Free moving

  4. Makana Body Cavity • No coelom present • No open area surrounded by body tissue • Gastrovascular cavity • Digestive compartment http://images.google.com/imgres?imgurl=http://blog.hotelclub.com/wp-content/uploads/2008/05/jellyfish2.jpg&imgrefurl=http://blog.hotelclub.com/the-incredible-jellyfish-lake/&usg=__BKagMTz8g47-VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhcKfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1

  5. Body Symmetry Chika • Radial Symmetry • Radiate from center • Any plane will cut into mirror images http://estb.msn.com/i/28/CE6ED47A2567BD0E2F316AE1291B4.jpg

  6. Michelle Nervous System • Non-centralized nerve net that coordinates movement • No brain http://www.biology-blog.com/images/blogs/11-2007/new-species-of-sea-anemone.jpg

  7. Makana Circulatory System • None :[ http://lesleehorner.files.wordpress.com/2009/12/jellyfish2.jpg

  8. Digestive System Chika • Pushes food into cavity using tentacles • Use of cnidocytes and nematocyst • Food comes through mouth/anus • No real, developed digestive system http://images.google.com/imgres?imgurl=http://blog.hotelclub.com/wp-content/uploads/2008/05/jellyfish2.jpg&imgrefurl=http://blog.hotelclub.com/the-incredible-jellyfish-lake/&usg=__BKagMTz8g47-VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhcKfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1

  9. http://static.howstuffworks.com/gif/jellyfish-9.jpg

  10. Excretory System Michelle • No real, developed excretory system • Undigested remains are pushed out through mouth/anus http://www.psychobeing.co.uk/doblog/wp-content/uploads/2009/11/MakingJellyfishBabies1.jpg

  11. Makana Locomotion/Musculature • Polyps are stationary • Medusae move by passive drifting and contractions of its bell-shaped body • Cubozoans actively pursue their prey http://img.brothersoft.com/screenshots/softimage/c/coral_clock_3d_screensaver-45155-1228962634.jpeg

  12. Chika Skeletal Type • No bones • The Gastrovascular Cavity acts as a hydrostatic skeleton • When the volume of the cavity is filled, it can change shape http://www.aquadirectory.us/wp-content/uploads/Glow%20Coral%20Fish.jpg

  13. Sensory Structures/Features Makana • Simple contractile tissues that can detect and respond to stimuli equally from all directions • Some Cubozoans have complex eyes embedded in their medusa http://www.nature.com/nature/journal/v440/n7082/images/440280a-i1.0.jpg

  14. Hydrozoan Reproduction Asexual Favorable environmental conditions Budding and Pinching off Sexual Deteriorating environmental conditions Resistant zygotes that remain dormant Michelle http://www.biology.uco.edu/PersonalPages/CButler/BIO1404/slides/Slide_37_Obelia_(wm).jpg

  15. http://www.palaeos.com/Invertebrates/Cnidaria/Images/obelia_cycle.gifhttp://www.palaeos.com/Invertebrates/Cnidaria/Images/obelia_cycle.gif

  16. Scyphozoans Reproduction Dominant stage: medusa Coastal jellyfish Alternate generations Sexual and Asexual Reproduction Open Ocean jellyfish No polyp stage Sexual and Asexual Reproduction Michelle http://graphics.stanford.edu/courses/cs348b-competition/cs348b-03/jellyfish/Jellyfish.jpg

  17. Cubozoans Reproduction Dominant Stage: Medusa (box-shaped) Alternate generations Asexual Reproduction Sexual Reproduction Michelle http://images.google.com/imgres?imgurl=http://i248.photobucket.com/albums/gg165/vampix3/jellyfish.jpg&imgrefurl=http://www.myspace.com/33046871&usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&tbnw=130&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-US%26ndsp%3D20%26tbs%3Disch:1

  18. Anthozoans Reproduction Dominant stage: polyp No medusa stage Asexual Reproduction Sexual Reproduction Michelle http://images.google.com/imgres?imgurl=http://i248.photobucket.com/albums/gg165/vampix3/jellyfish.jpg&imgrefurl=http://www.myspace.com/33046871&usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&tbnw=130&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-US%26ndsp%3D20%26tbs%3Disch:1

  19. Makana Gas Exchange • Lack specialized organs for gas exchange • Take in gases directly from surrounding water http://farm1.static.flickr.com/23/33904224_771803aeb7.jpg

  20. Unique Features Chika • Sea Wasps • One contains enough poison to kill 60 people http://www.zmescience.com/wp-content/uploads/2009/08/sea-wasp.jpg

  21. Ctenophora Also known as Comb Jellies 8 “combs” of cilia that propel it through the water To catch prey: If prey touches one of the two tentacles, specialized cells burst open Covers the prey with a sticky mass Makana http://people.bu.edu/jrf3/BI547/IMAGE_CTENOPHORA_Mnemiopsis.jpg

  22. Quiz Questions! Which of the following is present in Cnidarians? A circulatory system A nervous system A developed digestive system None of the above Answer: None of the above Chika http://thundafunda.com/33/underwater-animals-fish/Drifters,%20Jellyfish%20pictures%20underwater%20photos.jpg

  23. Quiz Questions! Which of the following animals is a Cnidarian? Octopus Sea Star Sea Anemone Clam Answer: Sea Anemone Makana http://www.biocrawler.com/w/images/f/fe/Obelia-Hydrozoa-at40x.jpg

  24. Quiz Questions! What type of body symmetry do Cnidarians have? Radial Symmetry Bilateral Symmetry Spherical Symmetry Asymmetric Answer: Radial Symmetry Chika http://www.valdosta.edu/~jlgoble/tclown1.jpg

  25. Quiz Questions! Which of the following are not one of the major classes of the phylum Cnidaria? Scyphozoa Cubozoa Cephalopods Anthozoa Hydrozoa Answer: Cephalopods Makana http://funscubadiver.com/gallery/bonaire-scuba-photo/bonaire-flower-coral.jpg