Endolimax

Endolimax nana is a non-pathogenic amoeba present in the human intestine.  It is related to Balamuthia mandrillaris and more distantly to  the Entamoebidae according to SSUrDNA analysis (Sogin et al 1996).

Sogin, M. L., Silberman, J.D, Hinkle, G. & Morrison, H.G. (1996). "Problems with molecular diversity in the eukarya.".Society of General Microbiology Symposium: Evolution of microbial Life ed.Roberts, D.M., Sharp, P., Alderson, G. & Collins, M.A. Cambridge University Press. pp167-184.