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Amoeba
Entamoeba histolytica (trophozoite) |
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| Motility | Pseudopods |
| Nucleus |
Peripheral chromatin - usually evenly distributed and uniform in size Karyosome - chromatin small, discrete; usually centrally located |
| Cytoplasm | Finely granular |
| Inclusions | RBCs occasionally |
| Pathogenic | YES: Invasive - usually causes Amoebic dysintary |
Entamoeba histolytica (cyst) |
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| Shape | Usually spherical, round to oval, with thick cell wall |
| Nucleus |
Four mature cyst, peripheral chromatin present Karyosome - small, discrete, usually centrally located |
| Cytoplasm | Chromatid bodies - present; elongate bars with bluntly rounded ends, cigar-shaped |
Entamoeba coli (trophozoite) |
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| Motility | Non-progressive, sluggish |
| Nucleus |
Peripheral chromatin - irregular in size and distribution Karyosome - chromatin is large, discrete, usually eccentrically located |
| Cytoplasm | Coarse; often vacuolated |
| Inclusions | May include bacteria, yeasts |
| Pathogenic | NO |
Entamoeba coli (cyst) |
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| Shape | Usually spherical |
| Nucleus |
8 nuclei in mature cyst Karyosome - large, discrete; usually eccentrically located |
| Cytoplasm | Chromatid bodies less frequently present; usually splinter-like pointed ends |
Iodamoeba buetschlii (trophozoite) |
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| Motility | Sluggish |
| Nucleus |
No peripheral chromatin - reddish purple when stained Karyosome - Large, usually centrally located |
| Cytoplasm | Vacuolated |
| Inclusions | Bacteria and yeasts |
| Pathogenic | NO |
Iodamoeba buetschlii (cyst) |
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| Shape | Ovoid or egg-shaped |
| Nucleus |
No peripheral chromatin Karyosome - large, usually eccentrically located |
| Cytoplasm | Glycogen compact, well-defined mass. Glycogen stains dark with iodine |