Jan 15, 2018 · The largest parasitic protozoan in humans is Balantidium coli. Similarities Between Cyst and Trophozoite. Cyst and trophozoite are two stages of the lifecycle of protozoans. Both cyst and trophozoite are unicellular. Both cyst and trophozoite consist of visible nuclei. Both cyst and trophozoite contain contractile vacuoles.
The genus Entamoeba was defined by Casagrandi and Barbagallo for the species Entamoeba coli, which is known to be a commensal organism. Lösch's organism was renamed Entamoeba histolytica by Fritz Schaudinn in 1903; he later died, in 1906, from a self-inflicted infection when studying this amoeba.
Entamoeba histolytica was first of all reported by a Russian Zoologist, Losch (1875), as Amoeba coli from the faeces of a patient suffering from dysentery. The genus Entamoeba was established by Cosagrandi and Barbagallo (1895); it should not, be confused with the genus Endamoeba which was established by Leidy (1879).
The only pathogen in this group is Balantidium coli, which causes a diarrhea-type infection called balantidiasis. The protozoan is transmitted to humans by the fecal-oral route and invades the large intestines causing ulceration. It is diagnosed by microscopically looking for B. coli in a fecal smear.
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Acanthamoeba has two evolutive forms, the metabolically active trophozoite and a dormant, stress-resistant cyst. Trophozoites are small, usually 15 to 25 μm in length and amoeboid in shape. Trophozoites are small, usually 15 to 25 μm in length and amoeboid in shape.