Compare

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

Gomphoneis herculeana LM1 Gomphoneis herculeana LM4B Gomphoneis herculeana LM4A Gomphoneis herculeana LM6 Gomphoneis herculeana LM2 Gomphoneis herculeana LM3 Gomphoneis herculeana LM5
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