Fig. 2. SEM. Left valve. Anterior end tapered; truncate to slightly depressed. Intercalary band smooth and wide.
Fig. 3. SEM. Cell surface covered with scattered valve pores within shallow depressions.
Fig. 4. SEM. Pores round, equal in size and situated in shallow depressions.
Fig. 5. SEM. Intercalary band smooth. Cells slightly convex. Marginal pores absent.
Fig. 6. SEM. Periflagellar area narrow and triangular with 8 platelets and 2 pores: a large oblong flagellar pore and a smaller auxiliary pore. A=auxiliary pore; F=flagellar pore.
Fig. 7. SEM. Periflagellar area fitted into narrow, V-shaped depression on right valve (lost during cell preparation) (arrow).
Fig. 8. LM. Left valve. Scattered pore arrangement. Anterior end slightly tapered and truncate.
Fig. 9. LM. Right valve. Central pyrenoid prominent.
Fig. 10. LM. Right valve.
Fig. 11. LM. Cyst nearly round with triple-layered membrane.