Fig. 2. SEM. Valve surface smooth with minute depressions and radially arranged trichocyst pores.
Fig. 3. SEM. Apical valve view. Cell center slightly convex. Periflagellar area highly ornate.
Fig. 4. SEM. Periflagellar area: valve view. Houses curved winged periflagellar collar and smaller protuberant periflagellar plate. Thickened apical ridge (arrows) surrounds periflagellar area.
Fig. 5. SEM. Periflagellar area: apical view (detached from valve). Large winged periflagellar collar (arrow) lies adjacent to auxiliary pore. Opposite and adjacent to flagellar pore is a smaller periflagellar plate (arrowhead). Thickened apical ridge borders periflagellar region. A=auxiliary pore; F=flagellar pore.
Fig. 6. SEM. Round trichocyst pores (arrow) with smooth edges; situated in furrowed depressions. Small round pores (arrowhead) also present, unevenly distributed on valve surface.
Fig. 7. SEM. Posterior end pointed and laced with trichocyst pores (double arrows) and small, round pores (single arrow).
Fig. 8. SEM. Ejected trichocysts on valve surface.
Fig. 9. SEM. Intercalary band transversally striated and sinous.
Fig. 10. Line drawing. Trichocyst pore arrangement.
Fig. 11. LM. Left valve. Large posterior nucleus. N=nucleus.