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Small specimens of S. construens var. venter could be confused with P. trainori. Pseudostaurosira trainori lacks lanceolate valves, has wider areolae composing the striae, stria density is higher and the spines are solid.

LM scalebar = 10 µm
Pseudostaurosira trainorii LM2 Pseudostaurosira trainorii LM3 Pseudostaurosira trainorii LM5 Pseudostaurosira trainorii LM1 Pseudostaurosira trainorii LM4
Length Range
2-9 µm
Width Range
1.5-4.5 µm
Striae in 10 µm
18-25

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

Pseudostaurosira elliptica

(Schum.) Edlund, E.Morales and S.A.Spauld. 2006

Pseudostaurosira elliptica LM5 Pseudostaurosira elliptica LM1 Pseudostaurosira elliptica LM3 Pseudostaurosira elliptica LM2 Pseudostaurosira elliptica LM6 Pseudostaurosira elliptica LM4
Length Range
6-14 µm
Width Range
3-3.5 µm
Striae in 10 µm
14-16