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The spines of P. pseudoconstruens are aligned with striae, in contrast to other species of Pseudostaurosira, which have spines aligned with costae.

The valves of P. parasitica are lanceolate, in contrast to the cruciform valves of P. pseudoconstruens. Pseudostaurosira robusta generally has two inflations in the valve outline, where P. pseudoconstruens has only one. Staurosira construens is similar in shape and areolae features, but the areolae may be elliptical in relation to the apical axis and more dense than 25 in 10 µm. The areolae of P. pseudoconstruens may be elliptical to the transapical axis and less dense than 20 in 10 µm. Staurosirella leptostauron has lineolate striae and the central area is smaller than in P. pseudoconstruens.

LM scalebar = 10 µm
Pseudostaurosira pseudoconstruens LM4 Pseudostaurosira pseudoconstruens LM1 Pseudostaurosira pseudoconstruens LM6 Pseudostaurosira pseudoconstruens LM7 Pseudostaurosira pseudoconstruens LM3 Pseudostaurosira pseudoconstruens LM2
Length Range
8-15.5 µm
Width Range
3.5-7 µm
Striae in 10 µm
8.5 near the center increasing to 18 at the apices

Staurosirella leptostauron

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

Staurosirella leptostauron LM1 Staurosirella leptostauron LM2 Staurosirella leptostauron LM4 Staurosirella leptostauron LM5 Staurosirella leptostauron LM3
Length Range
7-33 µm
Width Range
7-19 µm
Striae in 10 µm
5-11

Staurosira construens

Ehrenb. 1843

Staurosira construens LM4 Staurosira construens LM1 Staurosira construens LM6 Staurosira construens LM3 Staurosira construens LM2 Staurosira construens LM5
Length Range
6-15 µm
Width Range
5-9 µm
Striae in 10 µm
14-16

Pseudostaurosira parasitica

(W.Sm.) E.Morales 0

Pseudostaurosira parasitica LM1 Pseudostaurosira parasitica LM5 Pseudostaurosira parasitica LM3 Pseudostaurosira parasitica LM2 Pseudostaurosira parasitica LM4
Length Range
9-18 µm
Width Range
4.5-5 µm
Striae in 10 µm
19-21

Pseudostaurosira robusta

(Fusey) D.M.Williams and Round 1988

Cas 184007 08042014 0046 Clm Cas 184007 08042014 005 Clm Cas 184007 08042014 0028 Clm Cas 184007 08042014 003 Clm1 Cas 184007 08042014 0013 Clm Cas 184007 08042014 0055 Clm Cas 184007 08042014 0042 Clm
Length Range
13.3-17.1 µm
Width Range
2.6-4.1 µm
Striae in 10 µm
14-16