Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia amphibia

Grunow 1862

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Nitzschia alpina has smaller, more indistinct areolae.

Nitzschia semirobusta is often found in the same habitats and is of similar size. However, N. semirobusta has more rounded valve margins and fibulae extend across part of the valve face.

LM scalebar = 10 µm
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

Nitzschia alpina

Hust. 1943

Nitzschia alpina LM7 Nitzschia alpina LM6 Nitzschia alpina LM5 Nitzschia alpina LM4 Nitzschia alpina LM3 Nitzschia alpina LM2 Nitzschia alpina LM1
Length Range
13-21 µm
Width Range
3.3-4.2 µm
Striae in 10 µm
23-25

Nitzschia semirobusta

Lange-Bert. 1993

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