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Apices of P. microstauron are much narrower than the valves. Pinnularia suchlandtii has linear-lanceolate valves, with undifferentiated apices.

LM scalebar = 10 µm
Pinnularia rhombarea LM7 Pinnularia rhombarea LM6 Pinnularia rhombarea LM5 Pinnularia rhombarea LM4 Pinnularia rhombarea LM3 Pinnularia rhombarea LM2 Pinnularia rhombarea LM1
Length Range
44.9-74.5 µm
Width Range
10.2-12.5 µm
Striae in 10 µm
9-11

Pinnularia microstauron

(Ehrenb.) Cleve 1891

Pinnularia microstauron LM7 Pinnularia microstauron LM6 Pinnularia microstauron LM4 Pinnularia microstauron LM3 Pinnularia microstauron LM2 Pinnularia microstauron LM1
Length Range
27.7-81.3 µm
Width Range
7.2-12.2 µm
Striae in 10 µm
9-11

Pinnularia suchlandtii

Hust. 1943

Pinnularia suchlandtii LM1 Pinnularia suchlandtii LM2 Pinnularia suchlandtii LM7 Pinnularia suchlandtii LM3 Pinnularia suchlandtii LM4 Pinnularia suchlandtii LM5 Pinnularia suchlandtii LM6
Length Range
54.0-75.4 µm
Width Range
11.8-16.7 µm
Striae in 10 µm
10-11