Vocabulary Pseudocoelom = a body between

the mesoderrn and the endoderm

Cuticle = thick, tough, outer covering that protects the worm

VocabularyAnus = posterior opening of the

digestive trackLarva = immature from of an

oranism

Characteristics* Roundworms with long, cylindrical

bodies* Free-living; some parasites and

animals * Pseudocoelomates * Digestive tract with a mouth and

anus

ExamplesAscaris

* Parasitic worms that live in the

intestines of man, pig, and horses

* Contracted by eating water or food contaminated

with eggs

ExamplesHookworm

* Burrow through feet

* Larvae migrate to intestinal wall and sucks blood

ExamplesTrichinella

* Infects people who consume undercooked pig meat containing cysts

* Cysts release larvae, which burrow into intestinal wall and develop into adults

Other NematodesPinworms - live in lower intestine

and lay eggs on skin around anus

Filarial worms - live in human lymphatic system transmitted by mosquitoes