Navicula Subwalkeri Guide
Credit: Loren Bahls
  1. Longitudinal lines close to axial area
  2. Valves lanceolate
  3. Apices subrostrate
  4. Striae curved
  5. Central area small, rhombic

Valves are lanceolate, with subrostrate apices. The central area is small and rhombic. Longitudinal lines are visible close to the axial area. The striae are curved, especially near the central area.