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Monogeneaa group of ectoparasitic trematode FLUKES that have only one host and are parasitic on fish and amphibia. They are distinguished from the DIGENEA which have at least two hosts. See also BILHARZIA.
a subclass of trematode parasites that infest cold-blooded aquatic or amphibious vertebrates. Includes the genera Benedenia, Dactylogyrus, Diplozoon, Discocotyle, Gyrodactylus.