Diatoms of North AmericaDiatoms of North America
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Compare Fragilaria cyclopum

(Brutschy) Lange-Bert. 1980

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The central area of Hannaea arcus is unilateral and swollen on the ventral side.

LM scalebar = 10 µm
Synedra cyclopum LM1 Synedra cyclopum LM4 Synedra cyclopum LM5 Synedra cyclopum LM3 Synedra cyclopum LM2 Synedra cyclopum LM6
Length Range
31-70 µm
Width Range
3.2-7.3 µm
Striae in 10 µm
15-18

Hannaea arcus

(Ehrenb.) R.M.Patrick 1966

Hannaea arcus LM4 Hannaea arcus LM3 Hannaea arcus LM1 Hannaea arcus LM2 Hannaea arcus LM5 Hannaea arcus LM6
Length Range
15-80 µm
Width Range
4-7 µm
Striae in 10 µm
13-14