Compare Gomphonema christensenii
Gomphonema apuncto is very narrow and linear.
Gomphonema lousiananum is smaller, ranging from 3.8 to 5.5 µm in width. It also has relatively a wider axial area, that is, the striae are closer to the valve margin.
Gomphonema stoermeri, G. freesei and G. amerhombicum all possess stigmoids.
LM scalebar = 10 µm
Length Range
32.8-57.4 µm
32.8-57.4 µm
Width Range
6.1-7.8 µm
6.1-7.8 µm
Striae in 10 µm
13-16
13-16
Length Range
21.0-30.7 µm
21.0-30.7 µm
Width Range
3.0-4.1 µm
3.0-4.1 µm
Striae in 10 µm
13-16
13-16
Length Range
13.5-38.3 µm
13.5-38.3 µm
Width Range
3.8-5.5 µm
3.8-5.5 µm
Striae in 10 µm
11-12 at the valve center, 14-16 at the apices
11-12 at the valve center, 14-16 at the apices
Length Range
19-45 µm
19-45 µm
Width Range
4-6 µm
4-6 µm
Striae in 10 µm
13-15
13-15
Length Range
35.0-53.9 µm
35.0-53.9 µm
Width Range
6.5-7.5 µm
6.5-7.5 µm
Striae in 10 µm
12.1-14.5 at valve center, 14.2-16.2 at headpole, 11.7-15.4 at footpole
12.1-14.5 at valve center, 14.2-16.2 at headpole, 11.7-15.4 at footpole
Length Range
22.5-60 µm
22.5-60 µm
Width Range
5.6-7.7 µm
5.6-7.7 µm
Striae in 10 µm
13-15 at mid-valve, up to 17 at headpole
13-15 at mid-valve, up to 17 at headpole
