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Eunotia canicula is similar to E. incisa and the size range of the two species overlap. The apices of E. incisa, however, are more inset (more like a snout, or nose) than the apices of E. canicula. Furthermore, the valves of E. canicula are more narrow and the helicotoglossae are closer to the apex (less inset) as compared to E. incisa.

LM scalebar = 10 µm
Eunotia canicula LM5 Eunotia canicula LM3 Eunotia canicula LM Eunotia canicula LM2 Eunotia canicula LM1 Eunotia canicula LM5 Eunotia canicula LM4
Length Range
20-35 µm
Width Range
3.5-4.0 µm
Striae in 10 µm
14-15, areolae >35

Eunotia incisa

W.Sm. ex W.Greg. 1854

Eunotia incisa LM6 Eunotia incisa LM5 Eunotia incisa LM4 Eunotia incisa LM3 Eunotia incisa LM2 Eunotia incisa LM1 Eunotia incisa LM7
Length Range
12-50 µm
Width Range
2.8-5.0 µm
Striae in 10 µm
16-21 in the center valve