The trematodes ( Trematoda ) form one within the Phylum Plathelminthes.

All the trematodes are worms parasite S. preceding classifications divided them into two S (or two S), the Monogenea and the Digenea , according to whether their life cycle implied one or two hosts (Monoxène or hétéroxene). However the taxonomy of the plathelminthes is undergoing an important revision. The modern sources classify the Monogenea as a class separated within the phylum.

There exist two important groups in human pathology:

• the ditches hermaphrodites (ex: Clonorchose and Liver fluke)
• the Schistosome S (or Bilharzie) whose sexes are separate.

Biological cycle

See also: Larva

The trematode infests the host and changes there produces larvae which under the stages Sporocyste, redia, then of cercaires, the larva which life in hosts intermediary like molluscs. Enkystement of the cercaire at the exit of the intermediate host and which was fixed on a plant is called a métacénaire, of the Greek métâ which means change and kerkos which means tail. It is in this form that the Mouton for example introduces the Liver fluke.

See too

• Clonorchose

Simple: Trematoda