Diatoms of North AmericaDiatoms of North America
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Compare Hannaea arcus

(Ehrenb.) R.M.Patrick 1966

Compare

Hannaea arcus is distinguished from H. arcus var. amphioxys by a steeper angle of the ventral margin and a more abruptly swollen central central area in H. arcus var. amphioxys. Hannaea superiorensis is larger, more arcuate and found in the upper Great Lakes.

LM scalebar = 10 µm
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

Hannaea superiorensis

Bixby, Edlund and Stoermer 2005

Hannaea superiorensis LM7 Hannaea superiorensis LM6 Hannaea superiorensis LM4 Hannaea superiorensis LM3 Hannaea superiorensis LM2 Hannaea superiorensis LM1 Hannaea superiorensis LM5
Length Range
88-166 µm
Width Range
6-7 µm
Striae in 10 µm
16-18