Photo kindly provided by
J.J. Windsor (Aberystwyth Public Health Laboratory, Wales)
Co-author of the following:

D.fragilis: the unflagellated human flagellate
British Journal of Biomedical Science 1999; 56: 293-306
Dientamoeba fragilis: the unflagellated human flagellate.
Br J Biomed Sci. 1999;56(4):293-306.
Incidence of Dientamoeba fragilis in faecal samples submitted for routine microbiological analysis.
Br J Biomed Sci. 1998 Sep;55(3):172-5.
More laboratories should test for Dientamoeba fragilis infection.
BMJ. 1999 Mar 13;318(7185):735.
Laboratory detection of Dientamoeba fragilis.
Br J Biomed Sci. 1997 Sep;54(3):223-4.