SEM images of B. grimi. A. Overview of the ventral-left side (oral side), showing the general form, vestibulum (arrow) and uniformly arranged cilia. Scale bar = 10 µm. B. Overview of the right side, showing the body surface is partially flattened and thickly ciliated. Scale bar = 10 µm. C. Ventral-left view of the “V”-shaped vestibulum (arrow). Scale bar = 5 µm. D. The left anterior area of ciliate, showing the vestibulum (vb), an interkinetal ridge (rd), the groove (gr) and the cilia (cl) extending from grooves and are close to one another. Scale bar = 5 µm. E. Selected enlargement of Figure 3D, showing a ridge (rd) between cilia. Scale bar = 2 µm.