Fig. 2. SEM. Lateral view. Valve center concave and flattened. Intercalary band granulated and horizontally striated.
Fig. 3. SEM. Areolae round to oval with smooth edges. Some with central pores.
Fig. 4. SEM. Periflagellar area. V-shaped depression made up of 8 apical platelets and 2 pores: auxiliary pore and flagellar pore. a=auxiliary pore; f=flagellar pore.
Fig. 5. Line drawing. Areolae arrangement: 1000-1100 per valve. Center devoid of areolae.
Fig. 6. LM. Right valve.
Fig. 7. LM. Left valve. Nucleus posterior. N=nucleus.