Fig. 2. SEM. Right valve. Shape is variable.
Fig. 3. SEM. Left valve. Thecal surface smooth with scattered trichocyst pores.
Fig. 4. SEM. Anterio-lateral view: apical spine prominent and winged.
Fig. 5. SEM. Periflagellar area. Only one periflagellar pore (flagellar pore) present. Large winged spine on left valve (double arrows); smaller spine on right valve (single arrow) adjacent to flagellar pore.
Fig. 6. LM.
Fig. 7. Line drawing. Left valve. Trichocyst pore pattern.
Fig. 8. Line drawing. Right valve. Trichocyst pore pattern.