Nitzschia Soratensis Guide
  1. Valves small
  2. Apices rounded
  3. Valves linear to elliptic
  4. Fibulae relatively large
  5. Striae arched near the poles

Valves are linear to elliptic. The apices are rounded. Fibulae are large, with the middle one larger and more distinct than the others. Striae are parallel at the center of the valve, but arched near the poles, especially in smaller valves.