Cymbella Proxima Guide
Credit: Marina Potapova
  1. Valves strongly dorsiventral
  2. Ventral valve margin with tumid center
  3. Central area circular
  4. Stigmata 2-5
  5. Raphe lateral, filiform at distal and proximal ends

Valves are strongly dorsiventral with acuminate rounded apices, 18-23 µm wide. The ventral margin is tumid in the middle. The central area is circular with 2-5 stigmata. The raphe is lateral near the middle of the valve, becoming filiform near the distal and proximal ends. Striae are radiate, 7-8 in 10 µm. Areolae number 14-16 in 10 µm.