Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia lagerstedtii

(Cleve) A.Cleve 1934

Compare

Pinnularia borealis is larger, with narrower valve ends and slightly lower stria density.

Pinnularia curticostata is usually a bit more narrow, with a slightly lower stria density.

Pinnularia petersenii has a central fascia.

Pinnularia pseudoparva is very similar, but has subcapitate apices.

LM scalebar = 10 µm
Pinnularia lagerstedtii LM4 Pinnularia lagerstedtii LM2 Pinnularia lagerstedtii LM7 Pinnularia lagerstedtii LM3 Pinnularia lagerstedtii LM5 Pinnularia lagerstedtii LM1 Pinnularia lagerstedtii LM6
Length Range
11-26 µm
Width Range
5.2-6.2 µm
Striae in 10 µm
9-10

Pinnularia borealis

Ehrenb. 1843

Pinnularia borealis LM7 Pinnularia borealis LM6 Pinnularia borealis LM5 Pinnularia borealis LM4 Pinnularia borealis LM3 Pinnularia borealis LM2 Pinnularia borealis LM1
Length Range
27.1-47.6 µm
Width Range
8.0-10.2 µm
Striae in 10 µm
5-6

Pinnularia pseudoparva

Krammer and Lange-Bert. 1999

Pinnularia pseudoparva LM6 Pinnularia pseudoparva LM5 Pinnularia pseudoparva LM4 Pinnularia pseudoparva LM1 Pinnularia pseudoparva LM7 Pinnularia pseudoparva LM2 Pinnularia pseudoparva LM3
Length Range
22-31 µm
Width Range
5.4-6.4 µm
Striae in 10 µm
9-10

Also compare to

Pinnularia petersenii

BioData Reference
Krammer 2000 Pl 18 Fig 1-4

Pinnularia curticostata

Krammer and Lange-Bert.