Compare Pinnularia nobilis var. regularis
Pinnularia torta also has large, linear valves and a asymmetric axial area. Pinnularia torta is smaller, with a more linear central valve and ends, finer striae and more asymmetric axial area.
Pinnularia flexuosa has linear valves, with straight sides and less radiate striae in the central valve.
Pinnularia ectorii has a more expanded central valve; the valves are not as linear.
LM scalebar = 10 µm
Length Range
200-270 µm
200-270 µm
Width Range
32.5-39 µm
32.5-39 µm
Striae in 10 µm
5
5
Length Range
160.3-256 µm
160.3-256 µm
Width Range
24-31 µm
24-31 µm
Striae in 10 µm
7-8
7-8
Length Range
185–335 µm
185–335 µm
Width Range
29–44 µm
29–44 µm
Striae in 10 µm
5–6 throughout the valve, up to 9 around central area
5–6 throughout the valve, up to 9 around central area
