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Nematoda (Roundworm)

Nematoda (Roundworm). By: Keenan Faix and Timmy L ee. (fake). http://www.ento.csiro.au/science/nematodes/nem_monster.gif. Sample Animals. Soybean Cyst Nematode http://en.wikipedia.org/wiki/File:Soybean_cyst_nematode_and_egg_SEM.jpg. Unidentified Species of a Nemotoda (class Adenophorea).

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Nematoda (Roundworm)

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  1. Nematoda (Roundworm) By: Keenan Faix and Timmy Lee (fake) http://www.ento.csiro.au/science/nematodes/nem_monster.gif

  2. Sample Animals • Soybean Cyst Nematode • http://en.wikipedia.org/wiki/File:Soybean_cyst_nematode_and_egg_SEM.jpg Unidentified Species of a Nemotoda (class Adenophorea) http://images.google.com/imgres?imgurl=http://protist.i.hosei.ac.jp/pdb/Images/Multicell/Nematoda/sp_2.jpg&imgrefurl=http://protist.i.hosei.ac.jp/pdb/Images/Multicell/Nematoda/index.html&usg=__h_xLCz2q_2IJmbqA9ayKv6gl4nc=&h=484&w=606&sz=73&hl=en&start=52&um=1&itbs=1&tbnid=rO1sJUizZXHsCM:&tbnh=109&tbnw=136&prev=/images%3Fq%3Dnematoda%26start%3D36%26um%3D1%26hl%3Den%26safe%3Doff%26client%3Dsafari%26sa%3DN%26rls%3Den%26ndsp%3D18%26tbs%3Disch:1

  3. Body Cavity (Coelom) • Present • Pseudocoelomate –Body cavity is only partially lined by tissue derived from mesoderm

  4. Body Symmetry • Bilateral Symmetry http://bioweb.uwlax.edu/bio203/s2009/maiers_andr/nematode%205.bmp

  5. Nervous System • Has a Pharyngeal Nerve Ring • Essentially a ring of nerves starting near the mouth and extending back into the body

  6. Circulatory System • None - No blood system http://www.bu.edu/gk12/eric/nematode.jpg

  7. Digestive System • There is a digestive system with a through gut • Oral cavity opens with a muscular pharynx • Digestive glands found in gut

  8. Excretory System • Anus • Removes nitrogenous (ammonia) wastes through the body wall

  9. Locomotion • Longitudinal Muscles that produce thrashing movement • Muscular layer surrounds body cavity • Filled with blood-lacking fluids

  10. Skeletal Type • None http://www.inra.fr/hyppz/DESSINS/8032041.gif

  11. Sensory Structures • Lateral Nerves are sensory • Ventral Nerves combine both Lateral and Dorsal Nerve functions • Contain sensory bristles and papillae to give a sense of touch • Chemoreception organs near the head

  12. Reproduction • Sexual • Internal fertilization • Zygotes of most species are resistant to harmful conditions • Females may deposit over 100,000 eggs in a day

  13. Gas Exchange • Diffusion of gasses across the body wall, or cuticle

  14. Other Unique Features • Found in most aquatic habitat, soil, moist tissue of plants, and in body fluids and tissues • Body is covered by tough coat called the Cuticle which molts (sheds) after aging • Many are parasitic

  15. What type of body cavity do nematodes possess? • None • Coelomate • Pseudocoelomate • Acoelomate

  16. Which is not a function of the Cuticle? • Diffusion of gases • Removal nitrogenous wastes • Movement • For Molting

  17. Which one of these is not a Nematode Organ System? • Digestive • Nervous • Circulatory • Excretory

  18. What areas do most Nematodes resided in? • Soil • Aquatic habitats • Bodily Fluids and Tissues • Moist Tissues of Plants • All of the above • Volcanoes

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