Fig. 2. SEM. Lateral view. Cell ovate to convex.
Fig. 3. SEM. Periflagellar area: small, V-shaped shallow depression with prominent curved periflagellar collar (arrow) adjacent to auxiliary pore. Opposite is a smaller periflagellar plate (double arrows) adjacent to flagellar pore. a=auxiliary pore; f=flagellar pore.
Fig. 4. SEM. Valve surface smooth. Trichocyst pores present within surface depressions.
Fig. 5. SEM. Discharged trichocysts (arrow).
Fig. 6. SEM. Trichocyst pores round with smooth edge, similar in size, within deep round depressions.
Fig. 7. Line drawing. Trichocyst pore arrangement.
Fig. 8. LM. Left valve. Flagella present.
Fig. 9. LM. Right valve. Radial pore arrangement visible.