parasitic flatworms having external suckers for attaching to a host

Any parasitic animal organism belonging to the class Trematoda, including flukes.

(Trématodes) Class of acoelomate invertebrate of the phylum Platyhelminthes. A parasitic flatworm whose complex life cycle generally entails two or even three hosts.(Translated from Ramade, F. Dictionnaire encyclopédique de l'écologie et des sciences de l'environnement. Édiscience international, Paris, 1993.)

Any of numerous flatworms of the class Trematoda, including both external and internal parasites of animal hosts, that have a thick outer cuticle and one or more suckers or hooks for attaching to host tissue. Also called a fluke.

A parasitic fluke.