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Pinnularia bigibba can be distinguished from similar species by its constricted valve center.

LM scalebar = 10 µm
Pinnularia bigibba LM3 Pinnularia bigibba LM4 Pinnularia bigibba LM2 Pinnularia bigibba LM5 Pinnularia bigibba LM1
Length Range
36-38 µm
Width Range
5.4-5.6 µm
Striae in 10 µm
11

Also compare to

Pinnularia mesolepta

BioData Reference
Krammer 2000 Pl 82 Fig 9

Pinnularia angusta

(Cleve) Krammer 1992