Navicula Caterva Guide
Credit: Marina Potapova
  1. Valves lanceolate with nearly blunt to subrostrate ends
  2. Central area small
  3. Striae radiate in the center valve
  4. Striae 18-20 in 10 µm

Valves are lanceolate with protracted, subrostrate ends. The central area is small. Striae are radiate in center and parallel to slightly convergent at the apices, 18-20 in 10 µm. Striae may be bent in the middle of the valve. Short striae may alternate with longer ones around the central area.