Phylum Nematoda .
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Transcript of Phylum Nematoda .
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Phylum Nematoda
https://www.youtube.com/watch?v=X1YiIiPUQR8
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ROUNDWORMS
Kingdom Animalia
Phylum Nematoda
--Unsegmented worms
--Pseudocoelom
("false coelom")
-- body cavity contains
organs
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Characteristics
• Bilaterally symmetric
• Body has more than two cell layers, tissues and organs
• Body covered in a complex cuticle (protectivenoncellular layer of roundworms)
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• Has a nervous system with pharyngeal nerve ring.
• Has no circulatory system (no blood system)
• Respiration= diffusion
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Digestive tract with 2 openings: mouth & anus
Feeding
Free-living - predators
Parasites - humans and
animals
Reproduction: Sexual
reproduction,
Separate sexes
(male & female)
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Roundworms & Disease
Trichinosis
(trichinella worm)
- cysts within the muscles are
consumed (undercooked
food)
-- worm grows in intestine
-- forms cysts in the muscles
of the new host
-- symptom: terrible pain in
muscles
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https://www.youtube.com/watch?v=DC4ozHnm9bY&index=3&list=PLLACj7guzqJpyi94ecdzg2mzHdVb6NYDR
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Filarial Worms - found in Tropical regions of
Asia
-- usually transmitted
by mosquitoes
-- causes elephantiasis
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https://www.youtube.com/watch?v=dnWwHthkGkY
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Ascarid Worms (common
roundworm)
- lives in intestine
- eggs are passed out in the feces
Most roundworms infect
dogs, but occasionally they
find their way into human
hosts
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Hookworms
- burrow into the skin from soil
- mature in the intestines
--hooks used to attach and suck blood
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https://www.youtube.com/watch?v=8zqSLIUv_oQ
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C. elegans: A model organism●first organism to have DNA completely
sequenced●It is a very simple, free living roundworm
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https://www.youtube.com/watch?v=v4ePpLoS6xw
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References
• Biology Corner• http://www.earthlife.net/inverts/nematoda.html