Nitzschia inconspicua guide
  1. Apices protracted, narrow in larger specimens
  2. Fibulae small, square
  3. Striae can be observed in LM
  4. Central gap in fibulae

Valves are linear to linear-lanceolate in larger specimens, with protracted, narrow apices. Valves in smaller specimens are lanceolate, with rounded apices. Fibulae are square and evenly spaced, with a central gap. Striae can be observed in LM.