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Staurosira construens var. binodis should be compared to Pseudostaurosira robusta, which has a broad axial area and areolae that are wider and restricted to the valve margin.

LM scalebar = 10 µm
Staurosira construens var binodis LM1 Staurosira construens var binodis LM1 Staurosira construens var binodis LM3 Staurosira construens var binodis LM4 Staurosira construens var binodis LM2
Length Range
7-21 µm
Width Range
4-6 µm
Striae in 10 µm
13-16

Also compare to

Pseudostaurosira robusta

(Fusey) D.M.Williams and Round