Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia filiformis

(W.Sm.) F.Schütt 1896

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Nitzschia filiformis is less strongly curved than N. sigma. The apices of N. filiformis are less constricted than those in either N. clausii or N. sigma. The linear valve with prominent fibulae make this species easily recognizable from other common species of the genus. Nitzschia filiformis has valves that are more linear than those of N. nana, and its apices are also more broadly rounded.

LM scalebar = 10 µm
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

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

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

Also compare to

Nitzschia nana

Grunow in Van Heurck