Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia subgibba var. undulata

Krammer 1992

Compare

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
Pinnularia subgibba var undulata LM6 Pinnularia subgibba var undulata LM3 Pinnularia subgibba var undulata LM4 Pinnularia subgibba var undulata LM5 Pinnularia subgibba var undulata LM2 Pinnularia subgibba var undulata LM1
Length Range
67-83 µm
Width Range
8.30-9.30 µm
Striae in 10 µm
9-10

Pinnularia subgibba

Krammer 1992

Pinnularia subgibba LM7 Pinnularia subgibba LM4 Pinnularia subgibba LM2 Pinnularia subgibba LM1 Pinnularia subgibba LM5 Pinnularia subgibba LM6 Pinnularia subgibba LM3
Length Range
63-127 µm
Width Range
11.7-13.6 µm
Striae in 10 µm
8-9

Pinnularia macilenta

(Ehrenb.) Ehrenb. 1843

Pinnularia macilenta LM6 Pinnularia macilenta LM1 Pinnularia macilenta LM3 Pinnularia macilenta LM4 Pinnularia macilenta LM5 Pinnularia macilenta LM2 Pinnularia macilenta LM7
Length Range
71-124 µm
Width Range
14-16.5 µm
Striae in 10 µm
7-9

Pinnularia parvulissima

Krammer 2000

888 Gray 651 Gray 623 Gray 546 Gray 474 Gray 468 Gray 411 Gray
Length Range
40-88 µm
Width Range
9-12 µm
Striae in 10 µm
9-10

Also compare to

Pinnularia subbgibba var. sublinearis

Krammer 2000