References:-

Walker, G., Simpson, A. G. B., Edgcomb, V., Sogin, M. L. & Patterson, D. J. (2001) Ultrastructural identies of Mastigamoeba punctachora, Mastigamoeba simplex and Mastigella commutans and assessment of hypotheses of relatedness of the pelobionts (Protista)., Eur.J.Protistol. 37, 25-49.