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This species is distinguished from other lineolate Navicula species by the shape of the valves, the protracted apices and the length to width ratio (relatively low). 

Navicula trivialis has subrostrate apices, an elliptic central area bounded by mostly shortened striae (not alternating long-short striae) and has visible lineolae.

LM scalebar = 10 µm
Navicula salinarum LM1 Navicula salinarum LM2 Navicula salinarum LM4 Navicula salinarum LM3 Navicula salinarum LM5
Length Range
23-35 µm
Width Range
8-9 µm
Striae in 10 µm
13-17

Navicula trivialis

Lange-Bert. 1980

Navicula trivialis LM6 Navicula trivialis LM5 Navicula trivialis LM4 Navicula trivialis LM2 Navicula trivialis LM1
Length Range
28-44 µm
Width Range
8-10 µm
Striae in 10 µm
12