Navicula Venerabilis Guide
Credit: Marina Potapova
  1. Valves large
  2. Valves narrowly lanceolate with protracted ends
  3. Central area transversely elliptical
  4. Striae bent, strongly radiate in valve center

Valves are narrowly lanceolate with drawn-out subcapitate ends, 8.7-9.5 µm wide, 51-70 µm long. The central area is transversely elliptical. The striae are strongly radiate, bent in the middle of the valve and convergent at the apices, 10-12 in 10 µm. Areolae are 34-36 in 10 µm.