Diatoms of North AmericaDiatoms of North America
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Compare Staurosira stevensonii

Manoylov, E.Morales and Stoermer 2003

Compare

Staurosira construens, Staurosirella leptostauron, and Fragilariforma horstii do not extend more than the length of the inflated central area toward the ends. Staurosira construens is shorter in length. Staurosirella leptostauron has coarser, wider striae and a wider axial area. Fragilariforma horstii has a greater stria density.

LM scalebar = 10 µm
Staurosira stevensonii LM5 Staurosira stevensonii LM6 Staurosira stevensonii LM3 57578 Stauroneis Stevensonii Holotype 02 Staurosira stevensonii LM1 Staurosira stevensonii LM2 Staurosira stevensonii LM4
Length Range
17.6-21 µm
Width Range
6.9-8.5 µm
Striae in 10 µm
13.7-19.2

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

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

Fragilariforma horstii

E.Morales, Manoylov and Bahls 2012

Fragilariforma horstii LM1 Fragilariforma horstii LM2 Fragilariforma horstii LM3 Fragilariforma horstii LM4 Fragilariforma horstii LM5 Fragilariforma horstii LM6 Fragilariforma horstii LM7
Length Range
6.3-19.9 µm
Width Range
6.1-11.7 µm
Striae in 10 µm
34 in center to 40 ends