Compare Gomphonema mehleri
Compare
Gomphonema mexicanum has a higher stria density, more narrow apices and a lower L:W ratio.
Gomphonema ventricosum has a broader axial area, especially at the central area, and higher stria striae at mid-valve.
Gomphonema manubium is more robust, with a much broader axial area and higher areola density.
Gomphonema submehleri has a higher stria density and narrower valves.
Gomphonema gibba has a narrower headpole and less coarse stria. Note also, that similar but undescribed species, are present in the southeastern states.
LM scalebar = 10 µm
Length Range
33-59 µm
33-59 µm
Width Range
9.4-12.5 µm
9.4-12.5 µm
Striae in 10 µm
7.5-9 at center; 11-12 at headpole; 12-13 at footpole
7.5-9 at center; 11-12 at headpole; 12-13 at footpole
Gomphonema manubrium
Length Range
31.9-39.9 µm
31.9-39.9 µm
Width Range
8.9-9.8 µm
8.9-9.8 µm
Striae in 10 µm
11-14 in the center valve, 14-16 at the ends
11-14 in the center valve, 14-16 at the ends
Gomphonema gibba
Length Range
22-40 µm
22-40 µm
Width Range
7-8 µm
7-8 µm
Striae in 10 µm
10-12 in the center valve, 12-14 at the ends
10-12 in the center valve, 12-14 at the ends
Gomphonema submehleri
Length Range
24.9-37.2 µm
24.9-37.2 µm
Width Range
5.2-7.8 µm
5.2-7.8 µm
Striae in 10 µm
10-12 at the valve center, 14-16 at the head pole, 14-15 at the foot pole
10-12 at the valve center, 14-16 at the head pole, 14-15 at the foot pole