nematoda (roundworm) by: keenan faix and timmy lee (fake)
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Nematoda (Roundworm)
By: Keenan Faix and Timmy Leehttp://www.ento.csiro.au/science/nematodes/nem_monster.gif
(fake)
Sample Animals
• Soybean Cyst Nematode• http://en.wikipedia.org/wiki/
File:Soybean_cyst_nematode_and_egg_SEM.jpg
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
Unidentified Species of a Nemotoda (class Adenophorea)
Body Cavity (Coelom)
• Present• Pseudocoelomate –Body cavity is only
partially lined by tissue derived from mesoderm
Body Symmetry
• Bilateral Symmetry
http://bioweb.uwlax.edu/bio203/s2009/maiers_andr/nematode%205.bmp
Nervous System
• Has a Pharyngeal Nerve Ring–Essentially a ring of nerves starting near the mouth and extending back into the body
Circulatory System
• None - No blood system
http://www.bu.edu/gk12/eric/nematode.jpg
Digestive System
• There is a digestive system with a through gut• Oral cavity opens with a muscular pharynx• Digestive glands found in gut
Excretory System
• Anus• Removes nitrogenous (ammonia) wastes
through the body wall
Locomotion
• Longitudinal Muscles that produce thrashing movement
• Muscular layer surrounds body cavity• Filled with blood-lacking fluids
Skeletal Type
• None
http://www.inra.fr/hyppz/DESSINS/8032041.gif
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
Reproduction
• Sexual• Internal fertilization• Zygotes of most species are resistant to
harmful conditions • Females may deposit over 100,000 eggs in a
day
Gas Exchange
• Diffusion of gasses across the body wall, or cuticle
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
What type of body cavity do nematodes possess?
A) NoneB) CoelomateC) PseudocoelomateD) Acoelomate
Which is not a function of the Cuticle?
A) Diffusion of gasesB) Removal nitrogenous wastesC) MovementD) For Molting
Which one of these is not a Nematode Organ System?
A) DigestiveB) NervousC) CirculatoryD) Excretory
What areas do most Nematodes resided in?
A) SoilB) Aquatic habitatsC) Bodily Fluids and TissuesD) Moist Tissues of PlantsE) All of the aboveF) Volcanoes
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