Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia subgibba

Krammer 1992

Compare

Pinnularia gibba has capitate ends and wider axial area.

Pinnularia macilenta has broader, more lanceolate valves and less distinct broadly rounded to cuneate apices.

Pinnularia pseudogibba is more lanceolate and smaller.

Pinnularia subbgibba var. undulata has weakly triundulate sides and a more distinct fascia.

Pinnularia subgibba var. sublinearis has a more linear outline, with parallel sides.

Pinnularia parvulissima is smaller, with a consistently broad fascia.

LM scalebar = 10 µm
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

Pinnularia subgibba var. undulata

Krammer 1992

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

Also compare to

Pinnularia gibba

BioData Reference
Krammer 2000 Pl 68 Fig 1-8 Pl 69 Fig 1-5

Pinnularia

BioData Reference
Krammer 1992 Pl 48 Fig 8-14

Pinnularia subgibba var. sublinears

Krammer 2000