Navicula tenelloides has subrostrate valve apices and denser striae. 

Navicula salinicola has a smaller central area and more elliptic valves. 

Navicula bjoernoeyaensis has subrostrate valve apices, a higher stria density, and a smaller central area. 

Navicula vekhovii has more elliptic valves and coarser striae.

Navicula vilaplanii has more lanceolate valves.

LM scalebar = 10 µm
Length Range
18-25 µm
Width Range
2.7-3.3 µm
Striae in 10 µm
13-14
Navicula pseudotenelloides LM1
Navicula pseudotenelloides LM5
Navicula pseudotenelloides LM4
Navicula pseudotenelloides LM3
Navicula pseudotenelloides LM2
Navicula pseudotenelloides LM7
Navicula pseudotenelloides LM6
Navicula pseudotenelloides LM1 Navicula pseudotenelloides LM5 Navicula pseudotenelloides LM4 Navicula pseudotenelloides LM3 Navicula pseudotenelloides LM2 Navicula pseudotenelloides LM7 Navicula pseudotenelloides LM6

Also compare to

Navicula salinicola

Hustedt

Navicula tenelloides

Hustedt

Navicula vekhovii

Lange-Bertalot and Genkal

Navicula bjoernoeyaensis

Metzeltin, Witkowski and Lange-Bertalot