Morphology Entamoeba histolytica Cysts Trophozoites Thick wall Plasmalemma(thin 1-4 ring -like nuclei 1 ring-like nucleus Chromatoid body (blunt) Lacking Round 10-16 um Irregular, 10-60 um Concentratable LabileMorphology Entamoeba histolytica Cysts Trophozoites Thick wall Plasmalemma (thin) 1-4 ring-like nuclei 1 ring-like nucleus Chromatoid body (blunt) Lacking Round, 10-16 μm Irregular, 10-60 μm Concentratable Labile