Scanning electron micrographs of Symbiodinium psygmophilum motile cells. (A) Ventral view showing the episome, cingulum (c), sulcus (s), peduncle (PE), and hyposome. (B) Ventral-left lateral view showing the episome, cingulum (c), and hyposome. (C) Dorsal view showing the episome, cingulum (c), and hyposome. (D) Ventral-right lateral view showing the episome, cingulum (c), and hyposome. (E) Apical view showing the episome and elongated amphiesmal vesicle (EAV). (F) Apical view showing the EAV with small knobs. (G) Antapical view showing the hyposome. (H) Antapical-ventral view showing the sulcus (s) and peduncle (PE). S.p., posterior sulcus. Scale bars represent: A-H, 1 μm.