Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia sigmoidea

(Nitzsch) W.Sm. 1853

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Nitzschia vermicularis has narrower valves and a higher stria density. Nitzschia wuellerstorffii has shorter valves, a higher stria density and capitate apices. Nitzschia sigma has capitate apices, smaller valves and distinctly punctate striae. Nitzschia flexa has shorter, narrower valves and a higher stria density.

LM scalebar = 10 µm
Nitzschia sigmoidea LM3 Nitzschia sigmoidea LM1 Nitzschia sigmoidea LM2 L 6 50 1 L 6 50 2
Length Range
255-375 µm
Width Range
9-14.5 µm
Striae in 10 µm
24-26

Nitzschia sigma

(Kütz.) W.Sm. 1853

Nitzschia sigma LM3 Nitzschia sigma LM2 Nitzschia sigma LM4 Nitzschia sigma LM5 Nitzschia sigma LM1
Length Range
30.0-200.0 µm
Width Range
4.0-13.0 µm
Striae in 10 µm
19-24

Also compare to

Nitzschia vermicularis

(Kütz.) Hantzsch in Rabenh.

Nitzschia wuellerstorffii

Lange-Bert. in Lange-Bert. and Krammer

Nitzschia flexa

Schum.