1. The trophozoite is covered by a double-membrane envelope.
2. Its cytoplasm contains dense granular material containing ribonucleoprotein.
3. There are several food cavities in the cytoplasm. It is filled with hemoglobin.
4. Its nucleus is quite large and located laterally.
5. Cytoplasm contains mitochondria, endoplasmic reticulum, Golgibodies etc.