Compare Thalassiosira baltica | Species - Diatoms of North America

Compare

Thalassiosira visurgis, has only a single central fultoportula and a single ring of marginal fultoportulae. Thalassiosira weissflogii, has 3-6 central fultoportulae and a single, prominent rimoportula on the valve margin. Both T. lacustris and Actinocyclus normanii have an undulate valve face.

LM scalebar = 10 µm

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

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 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

Actinocyclus normanii

(W.Greg. ex Grev.) Hust. 1957

Actinocyclus normanii_LM5

Actinocyclus normanii_LM4

Actinocyclus normanii_LM3

Actinocyclus normanii_LM2

Actinocyclus normanii_LM1

Actinocyclus normanii_LM6

Diameter
14-72 µm

Also compare to

Thalassiosira visurgis

Hust. 1957

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