Cymbella Cistula Gibbosa Guide
Credit: Loren Bahls
  1. Ventral margin gibbous
  2. Valves up to 26 µm wide
  3. Stigmata 3-7

Valves are large, up to 26 µm wide, with a gibbous ventral margin. Stigmata number 3-7, typically on the ventral side of the central area. Areolae are distinct and number 16-21 in 10 µm