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Guide to Nitzschia filiformis

(W.Sm.) F.Schütt 1896

Nitzschia Filiformis Guide
Credit: Pat Kociolek
  1. Valves linear or slightly sigmoid
  2. Prominent central nodule
  3. Fibulae irregularly spaced and sized
  4. Fibulae positioned slightly off valve margin

The valves are generally linear but can also be slightly sigmoid, especially in smaller specimens. The central nodule is prominent. The fibulae are irregularly spaces and sized. At the central area, the fibulae are positioned slightly off of the valve margin.