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  1. 1. Platyhelminthes Lauren Wagner and Madison Page 5-19-09 3 rd Period Tapeworm Hymenolepis diminuta Fluke Megaptera Novaeangliae
  2. 2. Classification <ul><li>Trematoda- parasitic; 12,000 species; various suckers; infect 200 million people a year; 4 hosts. </li></ul><ul><li>Cestada- 3,500 species; parasitic; mouth no gut; live anywhere with vertebrates. </li></ul><ul><li>Turbellaria- aquatic; move with cilia; asexual reproduction (fission) </li></ul><ul><li>Mongenera- 1 host in life; endoparasitic; free swimming </li></ul>
  3. 3. Body <ul><li>Bilateral symmetry. </li></ul><ul><li>Flattened </li></ul><ul><li>Ribboned shape </li></ul><ul><li>3layers of body tissues with organs. </li></ul><ul><li>Blind gut- mouth no anus </li></ul><ul><li>The protonephndral excretory organs which replace the anus </li></ul><ul><li>No skeleton </li></ul><ul><li>Nervous system of longitudinal fibers </li></ul><ul><li>Unblinkable eyespots </li></ul>
  4. 4. Reproduction <ul><li>Eggs pass out with the primary host's feces and eventually contaminate water, where they are ingested by snails (the first intermediate host). </li></ul><ul><li>Eggs burrow into the digestive system. </li></ul><ul><li>Sporocyst forms a redia asexually. </li></ul><ul><li>It then leaves the snail and finds a fish host. It then affects the fish. </li></ul><ul><li>Most species of flatworms reproduce either sexually or asexually </li></ul>
  5. 5. Digestive System <ul><li>Flatworms absorb nutrients through their skin and excrete </li></ul><ul><li>wastes using specialized &quot;flame cells.&quot; </li></ul><ul><li>There is only a mouth opening. </li></ul><ul><li>The mouth eliminates food. </li></ul>
  6. 6. Circulatory System <ul><li>Transport oxygen, nutrients, and wastes through the body via a closed circulatory system. </li></ul><ul><li>Blood travels from the anterior to the posterior through a ventral blood vessel and then forward through a dorsal vessel. </li></ul><ul><li>Five pairs of tubes, the aortic arches, link the major vessels near the anterior. </li></ul><ul><li>Smaller vessels branch into each segment of the body. </li></ul><ul><li>Contractions of the ventral vessel force blood through the body.   </li></ul>
  7. 7. Respiratory System <ul><li>Earthworms have no gills or other respiratory organs. </li></ul><ul><li>Oxygen and carbon dioxide diffuse directly across only moist skin. </li></ul><ul><li>(mucus and a thin cuticle also help keep the earthworm’s skin moist.) </li></ul>
  8. 8. Environment <ul><li>Mainly found in aquatic areas. </li></ul><ul><li>Moist areas. </li></ul><ul><li>Marine, freshwater areas. </li></ul>
  9. 9. Human Interactions <ul><li>  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. </li></ul><ul><li>Platyhelminth parasites to humans with organic farming. </li></ul><ul><li>The popularity of raw or lightly-cooked foods, and imports of meat, sea food and salad vegetables from high-risk areas. </li></ul>
  10. 10. Unique Features <ul><li>Can be 50 meters long. </li></ul><ul><li>Need symbiotic relationships to survive fatty acids. </li></ul><ul><li>Well developed nervous system. </li></ul>
  11. 11. Pictures
  12. 12. Bibliography <ul><li>Google. May 19 th , 2009. </li></ul><ul><li> = </li></ul><ul><li>Platyhelminthes. May 19 th , 2009. </li></ul><ul><li>http:// </li></ul><ul><li>Platyhelminthes. May 19 th , 2009. </li></ul><ul><li> </li></ul><ul><li>Angelfire. May 19th, 2009. </li></ul><ul><li>http:// </li></ul><ul><li>Platyhelminthes. May 19 th 2009. </li></ul><ul><li>http:// </li></ul>
  13. 13. <ul><li>Platyhelminthes. May 19 th , 2009. </li></ul><ul><li> </li></ul><ul><li>Phylum Platyhelminthes. May19th, 2009. </li></ul><ul><li> </li></ul><ul><li>Platyhelminthes. May 19 th , 2009. </li></ul><ul><li> </li></ul><ul><li>Holt, Rinehart and Winston. Animals: Holt Science and Technology. Time Warning Company, 2000. </li></ul><ul><li>Tapeworms. May 21 st , 2009. </li></ul><ul><li> </li></ul>
  14. 14. <ul><li>Trematoda. May 21 st , 2009. </li></ul><ul><li>http://www. </li></ul><ul><li>What Are Tapeworms. May 21 st , 2009. </li></ul><ul><li> </li></ul><ul><li>May 21 st , 2009. </li></ul><ul><li> </li></ul>