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Eunotia diadema has a constant number of 6 dorsal undulations. A specimen of E. serra with 6 undulations may be distinguished from E. diadema by having shallower undulations and a tendency for the terminal undulations to coalesce with the apices. Eunotia tetraodon and Eunotia triodon have 4 and 3 dorsal undulations, respectively.

LM scalebar = 10 µm
Eunotiaserra1 Eunotiaserra2 Eunotiaserra3 Eunotiaserra4 Eunotiaserra5 Eunotiaserra6 Eunotiaserra7
Length Range
60-134 µm
Width Range
18-24 µm
Striae in 10 µm
9-13 in the valve center, 14-19 near the apices

Eunotia diadema

Ehrenb. 1837

Eunotia diadema LM1 Eunotia diadema LM2 Eunotia diadema LM3 Eunotia diadema LM4 Eunotia diadema LM5 Eunotia diadema LM6 Eunotia diadema LM7
Length Range
34-65 µm
Width Range
14-26 µm
Striae in 10 µm
7-10 in the valve center, 12-17 near the apices

Eunotia tetraodon

Ehrenb. 1838

Eunotiatet1 Eunotiatet2 Eunotiatet3 Eunotiatet4 Eunotiatet5 Eunotiatet6
Length Range
37-51 µm
Width Range
14.2-18.8 µm
Striae in 10 µm
8-10 in the valve center, 12-15 at the apices

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