Compare

Pinnularia subanglica and P. saprophila have straight sides and comparatively narrow axial areas.

LM scalebar = 10 µm
Pinnularia brauniana LM2 Pinnularia brauniana LM3 Pinnularia brauniana LM1 Pinnularia brauniana LM6 Pinnularia brauniana LM5 Pinnularia brauniana LM4
Length Range
35.7-74.4 µm
Width Range
7.1-10.4 µm
Striae in 10 µm
9-12

Pinnularia saprophila

Lange-Bert., H.Kobayasi and Krammer 2000

Pinnularia saprophila LM1 Pinnularia saprophila LM2 Pinnularia saprophila LM3 Pinnularia saprophila LM4 Pinnularia saprophila LM5 Pinnularia saprophila LM6 Pinnularia saprophila LM7
Length Range
22-45 µm
Width Range
5.2-6.7 µm
Striae in 10 µm
10-12

Also compare to

Pinnularia subanglica

Krammer