This pennate diatom is a benthic alga in Lake Kinneret that at times appears in the plankton, especially near the shore. Slightly S-shaped (sigmoid) cell. Stria forom axial and transverse rows. With 2 plate-like plastids, one along each side of the girdle.
aalster and tzohary
A Alster & T Zohary, Kinneret Limnological Laboratory
Photo taken with an Olympus BX50 Microscope equipped with DIC optics and PixeLink digital camera, mag. X40