Diatoms of North AmericaDiatoms of North America
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Compare Gomphoneis septa

(Moghadam) Kociolek, Stoermer and Bahls 1986

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This species has been confused with Gomphoneis eriense var. variabilis, due to the presence of the longitudinal lines close to the axial area. This species differs from the G. eriense var. variabilis by the shape of the valve, and the slightly larger valves (up to 90 µm in length).

LM scalebar = 10 µm
Gomphoneis septa LM3 Gomphoneis septa LM4 Gomphoneis septa LM5 Gomphoneis septa LM2 Gomphoneis septa LM1
Length Range
34-90 µm
Width Range
11-15 µm
Striae in 10 µm
11-12 at the center, 14-16 at the poles

Gomphoneis eriense var. variabilis

Kociolek and Stoermer 1988

Gomphoneis eriense var variabilis LM3 Gomphoneis eriense var variabilis LM5 Gomphoneis eriense var variabilis LM2 Gomphoneis eriense var variabilis LM1 Gomphoneis eriense var variabilis LM4
Length Range
25-45 µm
Width Range
9.5-12 µm
Striae in 10 µm
10-13 in the center, 14-16 at the poles