Nitzschia obtusa is more elongate, with a length of 221-300 µm, width of 8.5 – 11.4 µm and fibulae of 4-6 in 10 µm. A number of undescribed species similar to N. kurzeana and N. obtusa occur in North America. These occur in national surveys, although in low abundance and are yet to be documented.

LM scalebar = 10 µm
Nitzschia kurzeana LM1 Nitzschia kurzeana LM2 Nitzschia kurzeana LM4 Nitzschia kurzeana LM3 Nitzschia kurzeana LM5
Length Range
67-95 µm
Width Range
6.5-8.5 µm
Striae in 10 µm

Also compare to

Nitzschia obtusa