Biology 625
Supplemental visual material

Endolimax nana

Trophozoite and
Blastocystis hominis
Trophozoites in fecal smear

Trophozoites in fecal smear
Cysts in fecal smear
Endolimax nana is the smallest of human intestinal amoebae. Trophozoites measure 5-15 micrometers in length, usually 6-8 micrometers in length, and cysts 6-8 micrometers in diameter. Good fixation and staining, such as with Schaudinn's fixative and an iron hematoxylin stain, allow for relatively easy differentiation of the trophozoites from those of the slightly larger Iodamoeba buetschlii. However, with todays rapid fixatives and stains, and the resulting nuclear distortion, trophozoites of the two amoebae are easily confused. Although considered a non-pathogen, recent studies have shown E. nana to cause periodic, mild-moderate diarrhea and intestinal discomfort.


Originals; photographs by S.J. Upton

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Kansas State University | Biology Division