Cymbella Perfossilis Guide
Credit: Loren Balhs
  1. Valves wide
  2. Central area large, irregular
  3. Raphe lateral
  4. Proximal raphe ends hook-shaped
  5. Stigmata 4-8

Valves are large, 17-26 ┬Ám wide. The central area is large and irregular, with 4-8 stigmata on the ventral side. The raphe is lateral and terminates hook-shaped proximal ends that are deflected ventrally.