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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

Biology 11

Kingdom Animalia:

Phylum Nematoda:

The Roundworms


Phylum nematoda objectives
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
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


Phylum nematoda
Phylum Nematoda

The Roundworms

  • A very large phylum found in almost all habitats

  • most are small to microscopic

  • Reproduction is mostly sexual

Hookworms


Phylum nematoda1
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


Phylum nematoda2
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


Phylum nematoda3
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


Phylum nematoda4
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


Phylum nematoda5
Phylum Nematoda

4. Trichinella

  • From eating undercooked pork

  • Invades selected muscles forming painful cysts

  • Causes Trichanosis


Phylum nematoda6
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


Phylum nematoda7
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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