Description of Crithidia
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Kinetoplastid flagellates, monogenetic, possessing the characteristic choanomastigote form; the kinetoplast large and lateral, close to the nucleus in both nectomonad and haptomonad phases; flagellar pocket wide and funnel-shaped, its mouth occupying most of the truncate anterior end; parasites in the gut of Diptera, Hemiptera, Trichoptera and Hymenoptera.