the open mantle cavity of early molluscs.

It is likely that more complex life cycles evolved through a process of terminal addition, whereby digeneans survived predation of their mollusc host, probably by a fish. Other hosts were added by the same process until the modern diversity of life cycle patterns developed.

Important families

Digenea includes about 80 families. They are listed below, organised by order.

Digenea
*Diplostomida
**Suborder Diplostomata

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