Compare Nitzschia kurzeana
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
Length Range
67-95 µm
67-95 µm
Width Range
6.5-8.5 µm
6.5-8.5 µm
Striae in 10 µm
25-40
25-40
