Structure+-+Schistosomiasis

Three major schistosome species are known to infect humans. Urinary schistosomiasis, which targets the bladder, is caused by //Schistosoma haematobium// and occurs in Africa and the eastern Mediterranean. Intestinal schistosomiasis results from infection with //Schistosoma mansoni// (endemic to Africa, the eastern Mediterranean, the Caribbean, and South America), and //Schistosoma japonicum//, the Asian schistosome which is endemic mainly in China and, to a lesser extent, the Philippines.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC88974/

The schistosome is a parasitic flatworm. The specific parasitic flatworm that causes schistosomiasis is in the genus of trematodes.