Eunotia metamonodon has a more convex dorsal margin, lower stria density, variable spacing between striae, and apices that are slightly dorsally constricted coming to a terminal point.

Eunotia tauntoniensis has narrower valves, is less arcuate, and apices are expanded to apiculate.

Eunotia formica has variably spaced striae, an inflated valve center, weakly capitate apices with acutely rounded ends, and the helictoglossae are positioned further onto the ventral side of the apices.

Eunotia parallela has less arcuate valves, may be narrower, and the terminal raphe fissure and helictoglossae are positioned more ventrally.

LM scalebar = 10 µm
Length Range
64.9-117.9 µm
Width Range
8.8-11.3 µm
Striae in 10 µm
11-15
Eunotia pseudoparallela LM1
Eunotia pseudoparallela LM2
Eunotia pseudoparallela LM3
Eunotia pseudoparallela LM4
Eunotia pseudoparallela LM5
Eunotia pseudoparallela LM6
Eunotia pseudoparallela LM7
Eunotia pseudoparallela LM1 Eunotia pseudoparallela LM2 Eunotia pseudoparallela LM3 Eunotia pseudoparallela LM4 Eunotia pseudoparallela LM5 Eunotia pseudoparallela LM6 Eunotia pseudoparallela LM7

Eunotia metamonodon

Lange-Bert. 2011

Length Range
26.3–246.0 µm
Width Range
9.6–16.7 µm
Striae in 10 µm
9–11 at center of the valve, 12–15 near the apices
Eu Mono 1 Eu Mono 2 Eu Mono 4 Eumono 9 Eu Mono 5 Eu Mono 7 Eu Mono 6
Length Range
97.2-337.5 µm
Width Range
6.4-8.9 µm
Striae in 10 µm
12-14 in the valve center, 14-16 at the ends
Eutaut  Brant1212 337 45 6108 Eutautoniesis 1A Eutauntoniensis 2 Eutaut  Brant1006 Eutaut  Brant1188 Eutauntoniensis 5 Eutauntoniensis 6A

Eunotia formica

Ehrenb. 1843

Length Range
51.8–142.1 µm
Width Range
6.4–9.9, at the central swelling: 7.8–15.8 µm
Striae in 10 µm
6–10 in the center, 10–16 near the apices
Eu Formica 1 Eu Formi 6 Eu Formi 2 Eu Formi 3 Eu Formi 4 Eu Formi 5

Also compare to

Eunotia parallela

Ehrenb.