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Biology 11

Biology 11 . Kingdom Animalia : Phylum Nematoda : The Roundworms. Phylum Nematoda Objectives. Advances over Platyhelminthes Body plan and body systems 2 broad types and their example animals Parasitic worms (enter, live, hosts, effects). The Pseudocoelomates.

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Biology 11

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  1. Biology 11 Kingdom Animalia: Phylum Nematoda: The Roundworms

  2. Phylum Nematoda Objectives • Advances over Platyhelminthes • Body plan and body systems • 2 broad types and their example animals • Parasitic worms (enter, live, hosts, effects)

  3. The Pseudocoelomates Characteristics and Advances 1. Evolution of the anus allows for a complete digestive system - tube within a tube body plan 2. A pseudocoelom between mesoderm and endoderm

  4. Phylum Nematoda The Roundworms • A very large phylum found in almost all habitats • most are small to microscopic • Reproduction is mostly sexual Hookworms

  5. Phylum Nematoda A. Free living nematodes • Most nematodes live in water or soil • They are important in the ecology of soil - decomposers A Soil Nematode

  6. Phylum Nematoda B. Parasitic Nematodes Some of the worst worm parasites are members of this phylum 1. Ascaris sp. the Intestinal Roundworm • Most common world wide worm parasite - over 1 billion people have it • Lives in small intestine but travels through the body as a juvenile

  7. Phylum Nematoda 2. Hookworm • Human hookworm (Necator sp.) feeds on blood from inside of intestine • A single worm can drain 20 ml of blood per day • Most serious in children as can lead to physical and mental retardation • Enters as “Itch worm” between toes

  8. Phylum Nematoda 3. Pinworm (Enterobius sp.) • Lives in lower bowel • Female migrates out anus each night to lay eggs • Secretes irritating toxin to get person to scratch • Re-infection is oral

  9. Phylum Nematoda 4. Trichinella • From eating undercooked pork • Invades selected muscles forming painful cysts • Causes Trichanosis

  10. Phylum Nematoda 5. Filarial Worm • Small nematode that lives in human lymph ducts and blocks them • As a result, fluids can’t drain so accumulate resulting in severe, grotesque swelling below where the worm is Causes Elephantiasis

  11. Phylum Nematoda 6. The Guinea Stick Worm (Dracunculus sp.) • In Africa only • Enters while a person is in contaminated water and burrows through skin and grows • No cure - is removed by wrapping around a stick - one turn per day • Contains deadly toxin if broken it can kill its victim

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