Compare Pinnularia subgibba var. undulata
Pinnularia subgibba more linear margins, broader valves and only a slight transverse fascia.
Pinnularia subbgibba var. sublinearis has linear valves with parallel margins.
Pinnularia macilenta has wider valves and less subcapitate apices.
Pinnularia parvulissima has broader valves.
LM scalebar = 10 µm
Length Range
67-83 µm
67-83 µm
Width Range
8.30-9.30 µm
8.30-9.30 µm
Striae in 10 µm
9-10
9-10
Length Range
63-127 µm
63-127 µm
Width Range
11.7-13.6 µm
11.7-13.6 µm
Striae in 10 µm
8-9
8-9
Length Range
71-124 µm
71-124 µm
Width Range
14-16.5 µm
14-16.5 µm
Striae in 10 µm
7-9
7-9
Length Range
40-88 µm
40-88 µm
Width Range
9-12 µm
9-12 µm
Striae in 10 µm
9-10
9-10
