The larvae of Sepedon and their allies are well known to kill the snail Lymnaea, which is an intermediate host of the du长角沼蝇属幼虫可捕食鸭血吸虫(毛毕吸虫属)的中间宿主椎实螺,鸭血吸虫的尾蚴也可导致人的稻田皮炎;