Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"CDC%2520-%2520Schistosomiasis%2520-%2520Biology."
http://www.cdc.gov/parasites/schistosomiasis/biology.html
Centers%2520for%2520Disease%2520Control%2520and%2520Prevention
Public domain.