Nematoda

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Nematoda

  1. 1. Nematoda (nematodes - Heterodera glycines) By: Sarah Larsen 5/19/09 Period 4
  2. 2. Classification <ul><li>Usually classified into 5 main groups: </li></ul><ul><li>Bacterivores - bacteria eating nematodes </li></ul><ul><li>Fungivores - fungus eating nematodes </li></ul><ul><li>Predators - eat other nematodes of the same size. </li></ul><ul><li>Omnivores - eat more than one food material </li></ul><ul><li>Unknown - food source has not been determined yet. </li></ul>
  3. 3. Body form, symmetry, and skeletal systems <ul><li>Tripoblastic : Has 3 germ layers… Ectoderm(cuticle), Mesoderm and Endoderm. </li></ul><ul><li>Psuedocoelomate Animal : has a fully functional body cavity. </li></ul><ul><li>Bilateral Symmetry : when one side of the body mirrors the other. </li></ul><ul><li>Nematodes </li></ul><ul><li>do not have a </li></ul><ul><li>segmented </li></ul><ul><li>body. </li></ul>
  4. 4. Reproduction <ul><li>Generally sexual, sometimes asexual, involves internal fertilization. </li></ul><ul><li>Most species, sexes are separate, the male is smaller than the female. </li></ul><ul><li>Female nematodes can deploying over 100,000 eggs in a day. </li></ul>
  5. 5. Feeding and Digestive System <ul><li>Food is transported in the psuedocoloem by interior and exterior pressures. </li></ul><ul><li>Three parts: stomodeum, intestine, proctodeum. </li></ul><ul><li>The stomodeum = the “mouth and lips”, buccal cavity, and the pharynx (esophagus). </li></ul><ul><li>Buccal cavity = tube that can contain small ‘teeth’ , food is sucked through the mouth into the buccal cavity. </li></ul>
  6. 6. Circulatory System <ul><li>Nematodes have a separate circulatory system made up of muscular tubes. </li></ul><ul><li>Circulatory system : circulating fluid within the pseudocoelom. </li></ul>
  7. 7. Respiratory System <ul><li>Respiratory system : respiration by diffusion. </li></ul>
  8. 8. Environment <ul><li>Nematodes are mostly found naturally in soil. </li></ul><ul><li>Parasitic nematodes will live in a host such as an insect or plant. </li></ul>
  9. 9. Human Interactions <ul><li>Some parasitic nematodes are the cause of many dangerous and even life-threatening diseases. </li></ul><ul><li>Such as Trichinosis, Hookworm Infection, and Intestinal Roundworm Infection. </li></ul><ul><li>Some are very helpful to people ‘cause they eat pests that can kill plants. </li></ul>
  10. 10. Unique Features <ul><li>25,000 species have been identified, scientists estimate that that is only 5% of what could be out there. </li></ul><ul><li>Over 50 species live in humans alone. </li></ul><ul><li>Species range vastly in size, from under a millimeter to over a meter. </li></ul>
  11. 11. Species Hookworms ( Ancylostoma duodenale ) Roundworms ( Parascaris equorum ) Pinworms ( Strongyloides stercoralis )
  12. 12. Bibliography <ul><li>www.cusmibio.unimi.it/.../nematodes/index3.htm </li></ul><ul><li>http://www.eol.org/pages/2715 </li></ul><ul><li>http://entnemdept.ufl.edu/creatures/nematode/soil_nematode.htm </li></ul><ul><li>Silverstein,Robert. Invertebrates. New York, N.Y.:Twenty- First Century Books, 1996. </li></ul><ul><li>http://ucdnema.ucdavis.edu/imagemap/nemmap/ENT156HTML/vertlife </li></ul><ul><li>http://nematode.unl.edu/digestive_system.html </li></ul>

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