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Transcript
Nematoda (Roundworm)
(fake)
http://www.ento.csiro.au/science/nematodes/nem_monster.gif
By: Keenan Faix and Timmy Lee
Sample Animals
Unidentified Species of a
Nemotoda (class Adenophorea)
• Soybean Cyst Nematode
•
http://en.wikipedia.org/wiki/File:Soybean_cyst_nemato
de_and_egg_SEM.jpg
http://images.google.com/imgres?imgurl=http://protist.i.hosei.ac.jp/p
db/Images/Multicell/Nematoda/sp_2.jpg&imgrefurl=http://protist.i.ho
sei.ac.jp/pdb/Images/Multicell/Nematoda/index.html&usg=__h_xLCz2
q_2IJmbqA9ayKv6gl4nc=&h=484&w=606&sz=73&hl=en&start=52&um
=1&itbs=1&tbnid=rO1sJUizZXHsCM:&tbnh=109&tbnw=136&prev=/im
ages%3Fq%3Dnematoda%26start%3D36%26um%3D1%26hl%3Den%2
6safe%3Doff%26client%3Dsafari%26sa%3DN%26rls%3Den%26ndsp%3
D18%26tbs%3Disch:1
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)
B)
C)
D)
None
Coelomate
Pseudocoelomate
Acoelomate
Which is not a function of the Cuticle?
A)
B)
C)
D)
Diffusion of gases
Removal nitrogenous wastes
Movement
For Molting
Which one of these is not a Nematode
Organ System?
A)
B)
C)
D)
Digestive
Nervous
Circulatory
Excretory
What areas do most Nematodes
resided in?
A)
B)
C)
D)
E)
F)
Soil
Aquatic habitats
Bodily Fluids and Tissues
Moist Tissues of Plants
All of the above
Volcanoes