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Guide to Navicula angusta

Grunow 1860

Navicula Angusta Guide
Credit: Marina Potapova
  1. Valves linear
  2. Valves 6-7 µm wide, 35-70 µm long
  3. Central area moderately asymmetrical
  4. Striae radiate at center
  5. Striae convergent at apices

Valves are linear with slightly protracted ends. The central area is larger on the primary side, and semi-elliptical and smaller on the secondary side, but in some specimens it may be nearly symmetrical. Striae are radiate at the central valve, convergent near apices Striae are 11-12 in 10 µm. Areolae are lineolate, with approximately 32 in 10 µm.