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Staurosirella leptostauron has a similar appearance, but valves are much wider and cruciform in shape and striae are wider than costae. Staurosirella leptostauron var. dubia is also similar in appearance, but valves are lanceolate in shape, striae are narrower than costae, and spines are reduced with two per costae.

LM scalebar = 10 µm
Staurosirella rhomboides LM1 Staurosirella rhomboides LM5 Staurosirella rhomboides LM3 Staurosirella rhomboides LM2 Staurosirella rhomboides LM4
Length Range
13-55 µm
Width Range
5-9 µm
Striae in 10 µm
6-9

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

Staurosirella leptostauron var. dubia

(Grunow) Edlund 1994

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