Diatoms of North AmericaDiatoms of North America
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Compare Stauroforma exiguiformis

(Lange-Bert.) Flower, Jones and Round 1996

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The valves of Fragilariforma virescens are greater in length, width and have more rostrate ends. In girdle view, valves of F. virescens striae extending across the valve mantle, while the striae on the mantel of S. exiguiformis are reduced.

LM scalebar = 10 µm
Stauroforma exiguiformis LM4 Iwb 0040 06072015 08 Cl Stauroforma exiguiformis LM1 Stauroforma exiguiformis LM3 Stauroforma exiguiformis LM5 Stauroforma exiguiformis LM2
Length Range
4-22 µm
Width Range
3-4 µm
Striae in 10 µm
16-20

Fragilariforma virescens

(Ralfs) D.M.Williams and Round 1988

Fragilariforma virescens LM6 Fragilariforma virescens LM3 Fragilariforma virescens LM1 Fragilariforma virescens LM4 Fragilariforma virescens LM2 Fragilariforma virescens LM5
Length Range
15-60 µm
Width Range
6.5-7.0 µm
Striae in 10 µm
20-22