Fig. 2. SEM. Left valve. Apical margin inclined and slightly depressed. Cell sides straight.
Fig. 3. SEM. Left valve: apical region inclined and slightly depressed. Intercalary band smooth (arrowheads). Apical area with small pores along intercalary band (small arrows); larger pores scattered on valve surface in distinct pattern (large arrows).
Fig. 4. SEM. V-shaped periflagellar area is off-center on right valve; bears flagellar and auxiliary pore, unequal in size. A=auxiliary pore; F=flagellar pore.
Fig. 5. SEM. Longitudinal (arrowheads) and transverse (arrows) flagella emerge from one pore.
Fig. 6. SEM. Short tubular structure (arrow) protrudes from flagellar pore.
Fig. 7. LM. Right valve. Large central pyrenoid and posterior nucleus. N=nucleus; P=pyrenoid.