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27-2 Roundworms Kingdom Animalia Phylum Nematoda Unsegmented worms 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 intestine -- 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 intestine - eggs are passed out in the feces 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