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Navicula rhynchocephala has narrower valves, striae with finer, more closely spaced areolae, and a preference for fresher waters. Navicula rhynchotella is similar to large lentic forms of Navicula trivialis with subcapitate poles, from which it may be distinguished by its much coarser areolae. Navicula expecta has more elongate valves with nearly parallel sides.

LM scalebar = 10 µm
Navicula rhynchotella LM1 Navicula rhynchotella LM6 Navicula rhynchotella LM5 Navicula rhynchotella LM4 Navicula rhynchotella LM3 Navicula rhynchotella LM2 Navicula rhynchotella LM7
Length Range
47-54 µm
Width Range
12.1-13.5 µm
Striae in 10 µm
10-12

Navicula rhynchocephala

Ehrenb. 1844

Navicula rhynchocephala LM2 Navicula rhynchocephala LM3 Navicula rhynchocephala LM4 Navicula rhynchocephala LM1 Navicula rhynchocephala LM5
Length Range
48-53 µm
Width Range
9-10 µm
Striae in 10 µm
8-9 at the center, 11-12 towards the apices

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

Also compare to

Navicula expecta

VanLand.