Compare

Eunotia triodon has longer, wider valves.

Eunotia tridentula has less cuneate undulations on the dorsal margin and the middle undulation is more pronounced than others, mainly in the smallest specimens. Eunotia tridentula also has lower stria density.

Eunotia nupeliana
has wider valves and the central undulation is less pronounced than the others.

Eunotia perpusilla has two subapical swellings on the ventral margin.

LM scalebar = 10 µm
Lindsey 17 Lindsey 13 Lindsey 18 Lindsey 11 Lindsey 10 Lindsey 12
Length Range
17.8 - 28.5 µm
Width Range
7.3 - 8.8 µm
Striae in 10 µm
12-16

Eunotia triodon

Ehrenb. 1837

Eunotia triodon LM5 Eunotia triodon LM6 Eunotia triodon LM4 Eunotia triodon LM1 Eunotia triodon LM7 Eunotia triodon LM2 Eunotia triodon LM3
Length Range
47-74 µm
Width Range
15-23 µm
Striae in 10 µm
15-18 near valve center, 19-21 near the ends

Also compare to

Eunotia tridentula

Ehrenb.

Eunotia nupeliana

D.T. Ruwer and L. Rodrigues

Eunotia perpusilla

(Grunow) Åke Berg