Nematoda (Roundworm)

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Nematoda (Roundworm)
(fake)
http//www.ento.csiro.au/science/nematodes/nem_mon
ster.gif

• By Keenan Faix and Timmy Lee

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Sample Animals
Unidentified Species of a Nemotoda (class
Adenophorea)
http//images.google.com/imgres?imgurlhttp//prot
ist.i.hosei.ac.jp/pdb/Images/Multicell/Nematoda/sp
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Images/Multicell/Nematoda/index.htmlusg__h_xLCz2
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• Soybean Cyst Nematode
• http//en.wikipedia.org/wiki/FileSoybean_cyst_nem
  atode_and_egg_SEM.jpg

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Body Cavity (Coelom)

• Present
• Pseudocoelomate Body cavity is only partially
  lined by tissue derived from mesoderm

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Body Symmetry

• Bilateral Symmetry

http//bioweb.uwlax.edu/bio203/s2009/maiers_andr/n
ematode205.bmp
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Nervous System

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

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Circulatory System

• None - No blood system

http//www.bu.edu/gk12/eric/nematode.jpg
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Digestive System

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

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Excretory System

• Anus
• Removes nitrogenous (ammonia) wastes through the
  body wall

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Locomotion

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

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Skeletal Type

• None

http//www.inra.fr/hyppz/DESSINS/8032041.gif
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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

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Reproduction

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

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Gas Exchange

• Diffusion of gasses across the body wall, or
  cuticle

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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

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What type of body cavity do nematodes possess?

1. None
2. Coelomate
3. Pseudocoelomate
4. Acoelomate

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Which is not a function of the Cuticle?

1. Diffusion of gases
2. Removal nitrogenous wastes
3. Movement
4. For Molting

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Which one of these is not a Nematode Organ System?

• Digestive
• Nervous
• Circulatory
• Excretory

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What areas do most Nematodes resided in?

1. Soil
2. Aquatic habitats
3. Bodily Fluids and Tissues
4. Moist Tissues of Plants
5. All of the above
6. Volcanoes