These cells are relatively small, measuring approximately 30 µm in length, and come in various shapes, including ovoid, pyriform, or elongate. They are characterized by being laterally flattened and often exhibit a slight constriction towards the anterior end of the cell. The cytostome, or the cell’s oral groove, is located at or slightly ahead of the cell’s equator. In the anterior half, the anterior region lacks cilia, and the cytostome is positioned on the ventral side, close to the left border of the cell.These cells feature a small and inconspicuous oral aperture situated at the equator or slightly towards the anterior side. They are equipped with a small undulating membrane and three internal membranelles. Additionally, a caudal cilium is present.The macronucleus is typically located towards the anterior part of the cell, while a contractile vacuole is situated towards the posterior region. Overall, these cells are elongated, ovoid, and exhibit specific structural features, including the position of the cytostome and the presence of internal membranelles and cilia.