Eunotia boomsma has higher stria and areola densities and a biundulate dorsal margin. Eunotia soleirolii has a lower areola density and lacks prominent dorsal undulations. Furthermore, the apices of E. soleirolii vary from acutely to bluntly rounded. Smaller specimens of these two taxa may be indistinguishable. Eunotia neosiberica has lower stria and areola densities, but more importantly, E. neosiberica lacks a central dorsal swelling. Eunotia pseudopectinalis has recurved, bluntly rounded apices and lacks undulate margins.

LM scalebar = 10 µm
Eupectin 8 Eu Pectin 2 Eu Pectin 3 Eupectin 7 Eu Pectin 4 Eu Pectin 5 Eu Pectin 6
Length Range
28–85 µm
Width Range
6.7–9.0 µm
Striae in 10 µm
8.0–12 in the valve center, 11–16 at the ends.

Eunotia boomsma

Furey, Lowe and Johansen 2011

Eunotia boomsma LM7 Eunotia boomsma LM5 Eunotia boomsma LM3 Eunotia boomsma LM1 Eunotia boomsma LM2 Eunotia boomsma LM6 Eunotia boomsma LM4
Length Range
27-45 µm
Width Range
5.8-6.9 µm
Striae in 10 µm
12-13 in the center valve

Also compare to

Eunotia neosiberica

Lange-Bert., Kulikovskiy and Witkowski

Eunotia pseudopectinalis


Eunotia soleirolii

(Kütz.) Rabenh.