Diatoms of North AmericaDiatoms of North America
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Compare Thalassiosira weissflogii

(Grunow) G.A.Fryxell and Hasle 1977

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This species is distinguished from Thalassiosira lacustris by finer striae, flat valve face, distinct marginal fultoportulae and a single, large rimoportula. Thalassiosira baltica has marginal fultoportulae that are organized in two rows.

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

Thalassiosira lacustris

(Grunow) Hasle 1977

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 baltica

(Grunow) Ostenf. 1901

Thalassiosira baltica LM8 Thalassiosira baltica LM6 Thalassiosira baltica LM12 Thalassiosira baltica LM5 Thalassiosira baltica LM3 Thalassiosira baltica LM1 Thalassiosira baltica LM11
Diameter
18-27 µm