Diatomella Balfouriana Guide
Credit: Pat Kociolek
  1. Valves linear with rounded apices
  2. Septum present
  3. Axial area wide
  4. Proximal raphe ends distant

Valves linear, with rounded apices. The axial area is wide. A septum is present extending the entire length of the valve, and has three large openings, the largest in the center, smaller two at the ends. The proximal raphe ends are relatively distant from one another; they are widely spaced.