Diatoms of North AmericaDiatoms of North America
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Compare Thalassiosira lacustris

(Grunow) Hasle 1977

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This species is separated from T. weissflogii by the coarse striae, and distinctly tangentially undulate valves.

LM scalebar = 10 µm
Thalassiosira lacustris LM6 Thalassiosira lacustris LM2 Thalassiosira lacustris LM3 Thalassiosira lacustris LM4 Thalassiosira lacustris LM1 Thalassiosira lacustris LM5 Thalassiosira lacustris LM7
Diameter
11-57 µm

Thalassiosira weissflogii

(Grunow) G.A.Fryxell and Hasle 1977

Thalassiosira weissflogii LM3 Thalassiosira weissflogii LM4 Thalassiosira weissflogii LM1 Thalassiosira weissflogii LM2 Thalassiosira weissflogii LM6 Thalassiosira weissflogii LM5
Diameter
10-20 µm