Download - Phylum Nematoda
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Phylum Nematoda
RoundwormsMeans “Thread”
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Aaugh! They are Everywhere! Every fist-full of dirt Every rotten apple Each square meter of lake
bottom Most are free living Most are parasites
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Nematooooda! One study in Colorado estimated that
nematodes consumed about as much grass as a prairie dog colony.
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Characteristics Tough outer covering- Cuticle No circular muscles- run lengthwise
(move with a crazy thrusting movement) Smooth, round, nonsegmented Tube within a tube Separate sexes 15,000 known species
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Muscle Diagram
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Examples
Hookworm- Sucks blood in
intestine Enters between the
toes by boring in the skin
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Filaria Causes Elephantiasis Transfer by mosquito
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Trichinella Causes trichinosis Found in pork
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Pinworm Common among children Intense rectal itching Worms are visible near the anus at night
or early in the morning
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Horsehair Worm Parasites on
grasshoppers, crickets, locusts, katydids, and beetles
Other hosts include dragonflies, spiders, millipedes, centipedes, and leeches
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Persistent Many nematodes are able to suspend
their life processes completely when conditions become unfavorable; in these resistant states they can survive extreme drying, heat, or cold, and then return to life when favorable conditions return.
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