Phylum Nematoda: The Round Worms

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Phylum NematodaThe Round Worms

• Over 80000 species
• Cylindrical pseudocoeloemates
• Have effective hydroskeleton and musculature
• Inhabit aquatic areas. Most are parasitic.
• Most reproduce sexually. Females can produce
  100,000 eggs a day.
• Tricininella spiralis causes trichinosis in
  humans from under cooked pork
• Parasite burrows into muscle tissue forming cysts
• Hookworms and pinworms can parasitize digestive
  systems
• Others cause heartworm and elephantiasis

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Parasitic Nematodes
Roundworm
Hookworm
3
Heartworms
4
Guinea Worms
5
Elephantiasis (Filarial worm)
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Life Cycle of Filarial Worm
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Trichinosis
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Phylum Nemertina

• Similar to flat worms
• Inclide proboscus worms
• Acoelomate, but have functioning digestive tract
• Also have a funtioning blood vascular system