This is the third of three volumes of
Keys to the Trematoda
, a series on the systematics and identification of the Class Trematoda. It covers five superfamilies with the Order
Plagiorchiida
and the family
Didymozoidae
, with the keys for their identification at the family, subfamily and generic levels. It also includes a key to all dignean superfamilies, including those treated in detail in volumes one and two.