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Compare Staurosira construens var. venter

(Ehrenb.) P.B.Ham. 1992

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Staurosirella pinnata valves may be heteropolar. Striae are broader and composed of lineolate areolae. 

Smaller valves of Pseudostaurosira brevistriata may be confused with S. construens var. venter. However, the striae of P. brevistriata are composed of wide, round areolae, restricted to the valve margin.

LM scalebar = 10 µm
Staurosira construens var venter LM3 Staurosira construens var venter LM1 Staurosira construens var venter LM5 Staurosira construens var venter LM2 Staurosira construens var venter LM4
Length Range
5-26 µm
Width Range
4-5.5 µm
Striae in 10 µm
12-16

Pseudostaurosira brevistriata

(Grunow) D.M.Williams and Round 1987

Pseudostaurosira brevistriata LM3 Pseudostaurosira brevistriata LM4 Pseudostaurosira brevistriata LM1 Pseudostaurosira brevistriata LM2 Pseudostaurosira brevistriata LM5
Length Range
10-26 µm
Width Range
3.5-4 µm
Striae in 10 µm
12-15

Staurosirella pinnata

(Ehrenb.) D.M.Williams and Round 1987

Staurosirella pinnata LM2 Staurosirella pinnata LM1 Staurosirella pinnata LM3 Staurosirella pinnata LM4 Staurosirella pinnata LM5
Length Range
4-10 µm
Width Range
3-4 µm
Striae in 10 µm
11-14