Fig. 2. SEM. Left valve. Thecal surface smooth with scattered valve and marginal poroids (arrows).
Fig. 3. SEM. Oblique ventral view is ellipsoid. Intercalary band smooth. Marginal poroids evenly spaced (arrows).
Fig. 4. SEM. Periflagellar area triangular and unornamented, with a large flagellar pore and a small auxiliary pore. A=auxiliary pore; F=flagellar pore.
Fig. 5. SEM. Both flagella emerge from flagellar pore: longitudinal (arrowheads), transverse (arrows).
Fig. 6. SEM. At higher magnification, valve and marginal poroids kidney-shaped to oblong (arrowheads), and similar in size.
Fig. 7. SEM. Periflagellar area with short flagellum (arrows), and short, curved tubular structure (arrowheads), both emerge from flagellar pore (F). Width of curved tubular structure and flagellum are equal.
Fig. 8. SEM. Two tubular structures emerge from flagellar pore: one straight (arrow), and other curved (arrowheads).
Fig. 9. LM. Right valve. N=nucleus.
Fig. 10. LM. Right valve. Prominent central pyrenoid present. P=pyrenoid.