A genus of flukes (superfamily Heterophyidae) that encyst on fish and infect various fish-eating animals, including humans. Metagonimus yokogawai, an intestinal fluke widely distributed in the Far East and the Balkans and one of the smallest (1-2.5 mm) flukes infecting humans, is passed from Semisulcospira snails to cyprinoid fish and then to humans and other fish-eating mammals and birds. [meta- + G. gonimos, productive]
