Diatoms of North AmericaDiatoms of North America
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Compare Cyclotella kingstonii

(J.R. Johansen, Kociolek and R.L. Lowe) M.L. Julius, K.M. Downey, E.C. Theriot and A.J. Alverson 2021

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Thalassiosira lacustris has a valve face that is tangentially undulate and the single rimoportula is visible in LM. Actinocyclus normanii has a valve face that is concentrically undulate.

LM scalebar = 10 µm
Spicaticribra kingstonii LM11 Spicaticribra kingstonii LM20 Spicaticribra kingstonii LM3 Spicaticribra kingstonii LM13 Spicaticribra kingstonii LM15 Spicaticribra kingstonii LM2
Diameter
9.8-23.1 µm
Striae in 10 µm
16-19 near valve margin

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

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