Compare

Pinnularia borealis has smaller valves, less than 10 µm wide. Valves of P. lata are linear-elliptic and larger (14 to 35 µm wide), with even more blunt apices.

LM scalebar = 10 µm
Pinnularia rabenhorstii LM1 Pinnularia rabenhorstii LM2 Pinnularia rabenhorstii LM3 Pinnularia rabenhorstii LM4 Pinnularia rabenhorstii LM5 Pinnularia rabenhorstii LM6 Pinnularia rabenhorstii LM7
Length Range
49.6-71.1 µm
Width Range
12.1-17.9 µm
Striae in 10 µm
4-5

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 lata

(Bréb.) Rabenh. 1853

Pinnularia lata LM6 Pinnularia lata LM11 Pinnularia lata LM5 Pinnularia lata LM10 Pinnularia lata LM12 Pinnularia lata LM13
Length Range
80.2-127.6 µm
Width Range
23.2-28.7 µm
Striae in 10 µm
3-4

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