Ascaris suum

roundworm of swine 

*adults in small intestine-eggs are laid in small intestine-eggs pass in feces-larvae develop to infective 2nd stage in eggs-host ingests infective eggs-eggs hatch larvae follow tracheal migration and mature to adult stage. 

Ascaris suum

(egg) swine roundworm 

Trichuris suis

roundworm (whipworm) of swine

*adult nematodes live in cecum-eggs laid in cecum-eggs pass in feces-larvae develop to infective stage in eggs(in soil or vegetation)-host ingests infective eggs -eggs hatch, larvae mature to adult stage

Trichuris suis

egg- whipworm(roundworm) of swine 

Macracanthorhynchus hirudinaceus

egg- thorny headed worm of swine

-not prevelent in the u.s. 

M. hirudinaceus

thorny headed worm of swine

*not prevelent in the u.s.

*live in small intestine- eggs laid in small intestine-eggs pass in feces-grub ingests eggs which hatch, larvae develop to infective stage within the grub-host ingests infected grub-larvae mature to adult stage