#order_Polymastigina__Polymastigina  small usually parasitic flagellates
  supertype:  animal_order  the order of animals
  member of:  subclass_Zoomastigina
  member:  polymastigote  flagellates with several flagella
  member:  genus_Costia  a genus of flagellate protoctista
     member:  costia__Costia_necatrix  a flagellate that is the cause of the frequently fatal fish disease costiasis
  member:  genus_Giardia  flagellates parasitic in intestines of vertebrates
     member:  giardia  a suspected cause of diarrhea in humans
  member:  genus_Chilomastix__Chilomastix  flagellates parasitic in intestines of vertebrates including humans
  member:  genus_Hexamita__Hexamita  flagellates free-living or parasitic in intestines of birds
  member:  genus_Trichomonas  flagellates parasitic in alimentary or genitourinary tracts of vertebrates and invertebrates including humans
     member:  trichomonad  cause of trichomoniasis in women and cattle and birds

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