Phylum Nematoda Roundworms.

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Phylum Nematoda Roundworms

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

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

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

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

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

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

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

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