Fig. 2. SEM. Lateral view. Cell ovate. Intercalary band broad and transversely striated.
Fig. 3. SEM. Periflagellar area deeply indented. Both valves excavated apically.
Fig. 4. SEM. Periflagellar area is a deep, V-shaped, distally curved depression. Large angled rectangular periflagellar plate present. Valve surface smooth with 2 different size round pores: small (arrow) and large (double arrows).
Fig. 5. Line drawing. Pore arrangement. Large valve pores radially arranged (200 per valve).
Fig. 6. Line drawing.
Fig. 7. LM. Right valve. Posterior nucleus.
Fig. 8. LM. Left valve.