ABSTRACT
Progressive stages of the encystment of myxamoebae and protoplasmodia of Echinostelium minutum are documented using LM. The TEM and SEM studies indicate that myxamoebal and protoplasmodial cysts of E. minutum share some characteristics: the cyst wall consists of a single layer composed of densely packed microfibrils; the surface of the cyst wall is convoluted into numerous folds; the cyst wall of both phases undergoes complete dissolution during excystment.