Fig. 2. LM. Right valve. Pore arrangement.
Fig. 3. Line drawing. Pore arrangement.
Fig. 4. Line drawing. Pore arrangement.
Fig. 5. SEM. Periflagellar area: shallow, broad, V-shaped depression on right valve. Flared periflagellar collar encircles auxiliary pore (arrow). Both valves anteriorly indented. a=auxiliary pore; f=flagellar pore.
Fig. 6. LM. Large distinct central pyrenoid and large posterior nucleus. N=nucleus; P=pyrenoid.
Fig. 7. LM. Left valve. Flattened anterior end (arrow).
Fig. 8. LM. Alternate asexual reproduction: division cysts. Four-cell pair enclosed in hyaline membrane. Valves of third cell beginning to separate in preparation for cell division.
Fig. 9. LM. Alternate asexual division: division cysts. Eight cell chain enclosed within division cyst.
Fig. 10. LM. Triple-layered hypnozygote (resting cyst).