Hannaea arcus has smaller, wider, less arcuate valves. Hannaea baicalensis is only known from Lake Baikal in Siberia and lacks a tumid dorsal margin. Hannaea linearis has less arcuate valves and lacks recurved apices.

LM scalebar = 10 µm
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

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

Also compare to

Hannaea baicalensis

Genkal, Popovskaya and Kulikovskiy

Hannaea linearis

(Holmboe) Álvarez-Blanco and S.Blanco