HARTMANNELLA VERMIFORMIS

Scanning electron micrograph of a laboratory-grown potable water biofilm, with the presence of Hartmanella vermiformis cysts.
Aquatic bacteria were grown as biofilm on steel for one week. Hartmanella vermiformis protozoans were then added, which phagocytized the bacteria, that multiplied within vesicles and became cysts in which the bacteria will live until they rupture.