Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia sigma

(Kütz.) W.Sm. 1853

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The apices of N. sigma are capitate and more strongly curved than those in N. filiformis. Nitzschia sigma has apices that are more strongly constricted than those in N. clausii. The raphe of N. sigma follows the valve margin, while the raphe of N. clausii curves away from the margin near the valve center.

LM scalebar = 10 µm
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

Nitzschia clausii

Hantzsch 1860

Clausii 009 Clausii 004 Clausii 014 Clausii 011 Clausii 010 Clausii 007 Clausii 013
Length Range
20.0-68.0 µm
Width Range
3.0-5.0 µm

Nitzschia filiformis

(W.Sm.) F.Schütt 1896

Filiformis Gc106965H009 Filiformis Gc106965H001 Filiformis Gc106965H008 Filiformis Gc106965H004 Filiformis Gc106965H010 Filiformis Gc106965H006 Filiformis Gc106965H005
Length Range
27.0-150.0 µm
Width Range
4.0-5.0 µm
Striae in 10 µm
29-34