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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.
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3. They are acoelomate, triploblastic un-segmented and monogenetic trematodes.
4. Anterior end without or with a weak sucker J. Posterior end has a disc like oplsthaptor with 6 suckers arranged in a circle. The suckers have 2-3 hooks.
5. They are hermaphrodite and life history is completed in one host. Intestine is divided and eyes are absent.
6. Infection takes place through tadpole of the host.
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7. Eggs are released in urinary bladder of host from where they escape to outside with urine.