Compare Hannaea arcus
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
Length Range
15-80 µm
15-80 µm
Width Range
4-7 µm
4-7 µm
Striae in 10 µm
13-14
13-14
Length Range
88-166 µm
88-166 µm
Width Range
6-7 µm
6-7 µm
Striae in 10 µm
16-18
16-18
