Compare Gomphoneis eriensis var. variabilis
Compare
Gomphoneis eriensis var. angularis and G. eriensis var. rostrata have less rounded valves.
Gomphoneis subherculeana is broader and has coarster striae.
Gomphoneis septa is larger.
This species has been confused with Gomphonema ventricosum and G. manubrium, which lack longitudinal lines and have singly punctate striae.
LM scalebar = 10 µm
Length Range
25-45 µm
25-45 µm
Width Range
9.5-12 µm
9.5-12 µm
Striae in 10 µm
10-13 in the center, 14-16 at the poles
10-13 in the center, 14-16 at the poles
Gomphoneis eriensis var. angularis
Length Range
34-67 µm
34-67 µm
Width Range
8-12 µm
8-12 µm
Striae in 10 µm
10-13 at the central portion, 14-16 at the poles
10-13 at the central portion, 14-16 at the poles
Gomphoneis septa
Length Range
34-90 µm
34-90 µm
Width Range
11-15 µm
11-15 µm
Striae in 10 µm
11-12 at the center, 14-16 at the poles
11-12 at the center, 14-16 at the poles
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
