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Staurosira leptostauron var. dubia is similar in shape to Staurosira construens var. venter and Staurosirella pinnata. Staurosirella pinnata differs from S. leptostauron var. dubia by its smaller valves, oval valve outline and narrower striae. In addition, the costae of S. pinnata are usually narrower than the striae and spines are well-developed. The striae of Staurosira construens var. venter differ from those of S. leptostauron var. dubia by their narrower width. Furthermore, Staurosira construens var. venter has well-developed spines. Finally, S. leptostauron var. dubia is more heavily silicified than S. pinnata and S. construens var. venter.

LM scalebar = 10 µm
Staurosirella leptostauron var dubia LM4 Staurosirella leptostauron var dubia LM1 Staurosirella leptostauron var dubia LM3 Staurosirella leptostauron var dubia LM2 Staurosirella leptostauron var dubia LM5
Length Range
4-38 µm
Width Range
3.5-6.5 µm
Striae in 10 µm
6-10

Staurosira construens var. venter

(Ehrenb.) Hamilton 1992

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

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