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Eunotia tauntoniesis lacks a central swelling and valves are often more arcuate than E. formica. Eunotia metamonodon lacks gibbous margins and capitate ends.

LM scalebar = 10 µm
Eu Formica 1 Eu Formi 6 Eu Formi 2 Eu Formi 3 Eu Formi 4 Eu Formi 5
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

Eunotia metamonodon

Lange-Bert. 2011

Eu Mono 1 Eu Mono 2 Eu Mono 4 Eumono 9 Eu Mono 5 Eu Mono 7 Eu Mono 6
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

Also compare to

Eunotia tauntoniesis

Hust. ex R.M.Patrick