In this article we will discuss about the structure of Polystomum with the help of a diagram. 1. They are endoparasites in the urinary bladder of frogs, toads and turtles. 2. The body is dorsoventrally flattened and leaf-like. 3. They are acoelomate, triploblastic un-segmented and monogenetic trematodes. 4. Anterior end without or with a weak […]