Compare Pinnularia rexlowei
Pinnularia alabamae is has a similar valve outline, but is much greater in size.
Pinnularia gentilis differs by wider valves, rounded apices, strongly convergent striae at the valve ends, and absence of spines.
LM scalebar = 10 µm
Length Range
135–188 µm
135–188 µm
Width Range
18–23 µm
18–23 µm
Striae in 10 µm
7-8
7-8
Length Range
180-370 µm
180-370 µm
Width Range
32-48 µm
32-48 µm
Striae in 10 µm
5-6
5-6
