Compare Pinnularia acrosphaeria
Pinnularia brevicostata is larger (up to 150 µm) and lacks the gibbous center and mottled valve surface. Pinnularia cuneicephala has cuneate apices and a sinuous outer fissure of the raphe. Pinnularia nobilis is much larger with convergent striae near the apices.
LM scalebar = 10 µm
Length Range
52.7-82.9 µm
52.7-82.9 µm
Width Range
9.7-12.0 µm
9.7-12.0 µm
Striae in 10 µm
11-13
11-13
Length Range
79-142 µm
79-142 µm
Width Range
14-19 µm
14-19 µm
Striae in 10 µm
6-7
6-7
