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Platyhelminthes
 

Platyhelminthes

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    Platyhelminthes Platyhelminthes Presentation Transcript

    • Platyhelminthes Lauren Wagner and Madison Page 5-19-09 3 rd Period Tapeworm Hymenolepis diminuta Fluke Megaptera Novaeangliae
    • Classification
      • Trematoda- parasitic; 12,000 species; various suckers; infect 200 million people a year; 4 hosts.
      • Cestada- 3,500 species; parasitic; mouth no gut; live anywhere with vertebrates.
      • Turbellaria- aquatic; move with cilia; asexual reproduction (fission)
      • Mongenera- 1 host in life; endoparasitic; free swimming
    • Body
      • Bilateral symmetry.
      • Flattened
      • Ribboned shape
      • 3layers of body tissues with organs.
      • Blind gut- mouth no anus
      • The protonephndral excretory organs which replace the anus
      • No skeleton
      • Nervous system of longitudinal fibers
      • Unblinkable eyespots
    • Reproduction
      • Eggs pass out with the primary host's feces and eventually contaminate water, where they are ingested by snails (the first intermediate host).
      • Eggs burrow into the digestive system.
      • Sporocyst forms a redia asexually.
      • It then leaves the snail and finds a fish host. It then affects the fish.
      • Most species of flatworms reproduce either sexually or asexually
    • Digestive System
      • Flatworms absorb nutrients through their skin and excrete
      • wastes using specialized "flame cells."
      • There is only a mouth opening.
      • The mouth eliminates food.
    • Circulatory System
      • Transport oxygen, nutrients, and wastes through the body via a closed circulatory system.
      • Blood travels from the anterior to the posterior through a ventral blood vessel and then forward through a dorsal vessel.
      • Five pairs of tubes, the aortic arches, link the major vessels near the anterior.
      • Smaller vessels branch into each segment of the body.
      • Contractions of the ventral vessel force blood through the body.  
    • Respiratory System
      • Earthworms have no gills or other respiratory organs.
      • Oxygen and carbon dioxide diffuse directly across only moist skin.
      • (mucus and a thin cuticle also help keep the earthworm’s skin moist.)
    • Environment
      • Mainly found in aquatic areas.
      • Moist areas.
      • Marine, freshwater areas.
    • Human Interactions
      •   Over half of all known flatworm species are parasitic, Schistosomiasis, caused by Infection of humans by the broad fish tapeworm Diphyllobothrium latum occasionally causes vitamin B12 deficiency.
      • Platyhelminth parasites to humans with organic farming.
      • The popularity of raw or lightly-cooked foods, and imports of meat, sea food and salad vegetables from high-risk areas.
    • Unique Features
      • Can be 50 meters long.
      • Need symbiotic relationships to survive fatty acids.
      • Well developed nervous system.
    • Pictures
    • Bibliography
      • Google. May 19 th , 2009.
      • http://images.google.com/images?hl=en&q=platyhelminthes&gbv=2&aq=f&oq =
      • Platyhelminthes. May 19 th , 2009.
      • http:// zipcodezoo.com/Key/Animalia/Platyhelminthes_Phylum.asp
      • Platyhelminthes. May 19 th , 2009.
      • http://www.discoverlife.org/20/q?search=Platyhelminthes
      • Angelfire. May 19th, 2009.
      • http:// www.angelfire.com/ut/biocheat/PlatyhelminthesNemat.html
      • Platyhelminthes. May 19 th 2009.
      • http:// faculty.pnc.edu/jcamp/parasit/flatworm.html
      • Platyhelminthes. May 19 th , 2009.
      • http://cas.bellarmine.edu/tietjen/images/platyhelminthes.htm
      • Phylum Platyhelminthes. May19th, 2009.
      • http://io.uwinnipeg.ca/~simmons/lb6pg6.htm
      • Platyhelminthes. May 19 th , 2009.
      • http://www.bumblebee.org/invertebrates/PLATYHELMITHES.htm
      • Holt, Rinehart and Winston. Animals: Holt Science and Technology. Time Warning Company, 2000.
      • Tapeworms. May 21 st , 2009.
      • http://animals.jrank.org/pages/1532/Tapeworms-Cestoda.html
      • Trematoda. May 21 st , 2009.
      • http://www. answers.com/topic/trematoda
      • What Are Tapeworms. May 21 st , 2009.
      • http://www.wisegeek.com/what-are-flatworms.htm
      • May 21 st , 2009.
      • http://images.google.com/images?hl=en&um=1&sa=1&q=tapeworm&aq=f&oq=