What two advancements over platyhelminthes do nematodes have?

Colonic and cecal mucosa are the parasitic adults of Trichuris vulpis. Infection of this parasite can be confirmed with detection of eggs in the canine’s feces. Adult T. vulpis females can produce more than 2,000 eggs per day. These eggs can be detected in the canine’s feces by the fecal flotation method.

This method utilizes the differences of specific gravity of eggs, fecal debris, and the flotation solution. Although these eggs are dense, the use of proper fecal flotation technique using a sugar solution and centrifugation can increase the chances of identifying these eggs in a fecal sample. Multiple fecal samples may need to be tested as the eggs may be shed periodically.