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n pl :  a class, subclass, or suborder of parasitic platyhelminthic worms that were formerly usu. classified as trematodes but are currently considered to be more closely related to the tapeworms and that comprise flatworms ordinarily living as ectoparasites on a single usu. fish host throughout the entire life cycle - compare DIGENEA  .

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North Big Horn Hospital District (Lovell, Wyoming - Big Horn County)