The Strigeidida are an order of flatworms, belonging to the large group Digenea.It is usually divided into the suborders Strigeata and BrachylaimataThe former contain the Strigeoidea, Schistosomatoidea, Clinostomatoidea and Transversotrematoidea, the latter the Brachylaimoidea, Fellodistomatoidea and Bucephaloidea.A notable member is the genus Schistosoma, the blood fluke which causes bilharziosis.