retortamonas intestinalis retortamonas intestinalis retortamonas intestinalis is a species of retortamonads which is found in the gastrointestinal tract. retortamonas intestinalis scientific classification domain: eukaryota (unranked): excavata phylum: metamonada order: retortamonadida family: retortamonadidae genus: retortamonas species: r. intestinalis binomial name retortamonas intestinalis(wenyon & o'connor, 1917) ecology habitat retortamonas intestinalis resides in unhygienic areas and are fond of extremely warm climates, inferring that they do not survive in the cold. infection how it spreads retortamonas intestinalis usually spreads through human hosts (as nonhuman hosts containing this organism have not been reported) in the form of cysts via the stool of the individual. however, the probability of infection through this is very low, as the common factors pertaining to infection is the exposure of unsanitary contamination and overcrowding of the populus.