Fig. 2. SEM. Periflagellar area small, shallow, V-shaped depression on right valve. f=flagellar pore; a=auxiliary pore.
Fig. 3. SEM. Anterio-lateral view. Each areola with small round pore at base (arrow).
Fig. 4. SEM. Intercalary band broad, transversely rugose; sinuous rugae unique to this species. Cells slightly concave in center.
Fig. 5. LM. Right valve. Large central pyrenoid. Flagella present. Striated valve margins observable.
Fig. 6. LM. Right valve. Large central pyrenoid and intercalary band present.
Fig. 7. LM. Left valve. Empty theca: areolae arrangement.
Fig. 8. Line drawing. Areolae arrangement.