Encyonema kamtschaticum parvum guide2
  1. Valves <14 µm wide
  2. Apices narrow
  3. Ventral margin concave, with tumid middle
  4. Axial area narrow

Valves are dorsiventral, with narrow apices. Valves are small, less than 14 µm wide. The ventral margin is weakly concave, with a tumid center. There is no central stigmoid. The axial area and central area are narrow.