1. Phylum Nematoda
Roundworms

2. Phylum Nematoda Common Name: Round Worms Unsegmented worms
Body Form: Pseudocoelom ("false coelom”)
body cavity contains organs
Digestive tract with 2 openings: mouth & anus

3. Feeding Free-living - predators Parasites - humans and animals
Reproduction: Sexual reproduction,
Separate sexes (male & female)

4. Roundworms & Disease Trichinosis (trichinella worm)
cysts within the muscles are consumed (undercooked food)
worm grows in intestines
forms cysts in the muscles of the new host
symptom: terrible pain in muscles

5. Filarial Worms - found in Tropical regions of Asia
-- usually transmitted by mosquitoes -- causes elephantiasis

6. Ascarid Worms (common roundworm) - lives in intestines - eggs are passed out in the feces
Most roundworms infect dogs, but occasionally they find their way into human hosts

7. Hookworms
- burrow into the skin from soil - mature in the intestines -hooks used to attach and suck blood

8. Research on C. elegans
first organism to have DNA completely sequenced
It is a very simple, free living roundworm