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Guide to Nitzschia semirobusta

Lange-Bert. 1993

Nitzschia Amphiboides Guide
Credit: Dessie Underwood
  1. Valves linear to lanceolate
  2. Valves taper to bluntly rounded apices
  3. Striae distinctly punctate
  4. Fibulae thick at valve margin, thin toward opposite valve margin

Valves are linear to lanceolate that taper to bluntly rounded apices. Striae are distinctly punctate. The raphe is strictly eccentric. Fibulae are thick at the valve margin and decrease in thickness as they extend to the opposing valve margin. Fibulae may be irregularly spaced along the valve margin with 1-4 striae separating them.