General features Encysted metacercaria is usually the infective stage Schistosoma--cercaria) Egg has operculum except blood fluke Features reflecting adaptation to parasitism o Organs of attachment developed D Retardation of digestive system a Highly developed reproductive system◼ Encysted metacercaria is usually the infective stage (Schistosoma-- cercaria) ◼ Egg has operculum except blood fluke ◼ Features reflecting adaptation to parasitism  Organs of attachment developed  Retardation of digestive system  Highly developed reproductive system General features