A genus of freshwater and coprophilic protozoan flagellates in which members have one anterior and one posterior flagellum. Species have been isolated from the intestine or feces of humans and several types of domestic livestock, but have usually proved to be other genera such as Trichomonas or Chilomastix.
[G. kerkos, tail + monas (monad-), unit, monad]
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Examples: glitazone, GI cocktail, etc.