a genus of blood flukes (digenetic trematodes) in the family Schistosomatidae. Includes, as well as those listed below, O. dattai.
occurs in the mesenteric veins of zebu cattle.
found in the mesenteric veins of most grazing herbivores and cats. Causes hepatic cirrhosis and nodules in the intestinal wall accompanied by loss of body weight in small ruminants.