Diatoms of North AmericaDiatoms of North America
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Compare Simonsenia delognei

Lange-Bert. 1979

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Simonsenia delognei does not have true fibulae and its striae are not resolved in the LM, while Nitzschia valdecostata has fibulae and resolved striae. Simonsenia delognei also has narrower valves with finer, more protracted apices.

LM scalebar = 10 µm
Simonsenia delognei LM5 Simonsenia delognei LM4 Simonsenia delognei LM3 Simonsenia delognei LM1 Simonsenia delognei LM2
Length Range
9.5-14.5 µm
Width Range
2.5 µm

Nitzschia valdecostata

Lange-Bert. and Simonsen 1978

Nitzschia valdecostata LM4 Nitzschia valdecostata LM5 Nitzschia valdecostata LM7 Nitzschia valdecostata LM1 Nitzschia valdecostata LM6 Nitzschia valdecostata LM3 Nitzschia valdecostata LM2
Length Range
10.0-25.0 µm
Width Range
3.0-5.0 µm
Striae in 10 µm
17-19