Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia turgidula

(Grunow ex Cleve) Kulikovskiy, Lange-Bert. and Metzeltin 2010

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Pinnularia acrospheria has more linear valves, lacking undulate margins. Pinnularia acrospheria, P. turgidula, and varieties are distinguished from other Pinnularia by their relatively wide valves and externally mottled axial areas.


LM scalebar = 10 µm
Pinnularia turgidula LM4 Pinnularia turgidula LM2 Pinnularia turgidula LM6 Pinnularia turgidula LM5 Pinnularia turgidula LM7 Pinnuaria turgidula LM1 Pinnularia turgidula LM3
Length Range
48-90 µm
Width Range
12-15 µm
Striae in 10 µm
11-12

Pinnularia acrosphaeria

W.Sm. 1853

Pinnularia acrosphaeria LM7 Pinnularia acrosphaeria LM6 Pinnularia acrosphaeria LM5 Pinnularia acrosphaeria LM4 Pinnularia acrosphaeria LM3 Pinnularia acrosphaeria LM2 Pinnularia acrosphaeria LM1
Length Range
52.7-82.9 µm
Width Range
9.7-12.0 µm
Striae in 10 µm
11-13