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Gomphoneis herculeana var. abundans differs from G. herculeana by the proportionately more slender valves, and from G. minuta by the larger valves.

LM scalebar = 10 µm
Gomphoneis herculeana var. abundans LM2 Gomphoneis herculeana var. abundans LM5 Gomphoneis herculeana var. abundans LM4 Gomphoneis herculeana var. abundans LM3 Gomphoneis herculeana var. abundans LM1
Length Range
76-160 µm
Width Range
16-25 µm
Striae in 10 µm
12-14 at the headpole, 13-16 at the footpole

Gomphoneis herculeana

(Ehrenb.) Cleve 1894

Herculeana 001 Herculeana 004B Herculeana 004A Herculeana 006 Herculeana 002 Herculeana 003 Herculeana 005
Length Range
50-165 µm
Width Range
22-34 µm
Striae in 10 µm
8-12 in the central valve, 12-14 at the headpole, 13-16 at the footpole

Gomphoneis minuta

(J.L.Stone) Kociolek and Stoermer 1988

Minuta 005 Minuta 002 Minuta 001 Minuta 003 Minuta 004
Length Range
20-128 µm
Width Range
14-26 µm
Striae in 10 µm
10-12