Compare

Neidium inconstans has a wider, less diagonal and more asymmetric central area. In addition stria and areola density are lower in N. inconstans than N. fogedii. Neidium kozlowii has larger valves and a lower stria density.

LM scalebar = 10 µm
Neidium fogedii LM6 Neidium fogedii LM5 Neidium fogedii LM4 Neidium fogedii LM3 Neidium fogedii LM2 Neidium fogedii LM1
Length Range
33-55 µm
Width Range
9.3-11.1 µm
Striae in 10 µm
17-18

Also compare to

Neidium kozlowii

Mereschk. 1906