Navicula elsoniana has narrower ends and grows in brackish water. Navicula hanseatica has more widely spaced striae and coarser areolae. Navicula rhynchocephala has longer valves and striae that are more widely spaced around the central area. Navicula rhynchotella is larger, has coarser areolae and grows in brackish waters.

LM scalebar = 10 µm
Navicula caroliniae LM6 Navicula caroliniae LM5 Navicula caroliniae LM4 Navicula caroliniae LM3 Navicula caroliniae LM2 Navicula caroliniae LM1
Length Range
23-41 µm
Width Range
7.9-9.9 µm
Striae in 10 µm

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 rhynchotella

Lange-Bert. 1993

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

Navicula elsoniana

R.M.Patrick and Freese 1961

Navicula elsoniana LM1 Navicula elsoniana LM5 Navicula elsoniana LM6 Navicula elsoniana LM4 Navicula elsoniana LM3 Navicula elsoniana LM2
Length Range
29.5–38.5 µm
Width Range
11–11.5 µm
Striae in 10 µm

Also compare to

Navicula hanseatica

Lange-Bert. and Stachura 1998