The Plagiorchiida are a large order of flatworms (synonym is Echinostomida). They belong to the Digenea, a large subclass of flukes. This order contains relatively few significant parasites of humans. The following suborders are placed here: \n* Apocreadiata \n* Bivesiculata \n* Bucephalata \n* Echinostomata \n* Haplosplanchnata \n* Hemiurata \n* Heronimata \n* Lepocreadiata \n* Monorchiata \n* Opisthorchiata \n* Pronocephalata \n* Transversotremata \n* Xiphidiata \n* Zoogonata