Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia semirobusta

Lange-Bert. 1993

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Note that a broad concept is presented here. See text to left for further explanation.

Nitzschia amphibia is often found in the same habitats and is of similar size and shape. However, N. amphibia lacks the thickened fibulae. Furthermore, N. amphibia has a prominent central nodule.

Denticula kuetzingii has fibulae that extend across a valve from margin to margin with a similar thickness.

LM scalebar = 10 µm
Nitzschia semirobusta LM4 Nitzschia semirobusta LM3 Nitzschia semirobusta LM2 Nitzschia semirobusta LM1 Nitzschia semirobusta LM5
Length Range
9.5-22 µm
Width Range
4.3-5.2 µm
Striae in 10 µm
14-18

Nitzschia amphibia

Grunow 1862

Nitzschia amphibia LM3 Nitzschia amphibia LM5 Nitzschia amphibia LM2 Nitzschia amphibia LM1 Nitzschia amphibia LM4
Length Range
14-37 µm
Width Range
4.0-4.5 µm
Striae in 10 µm
14-18

Also compare to

Denticula kuetzingii

Grunow