Compare

Stauroneis beeskovea shares the same valve shape and strongly radiate striae as S. mangelsdorffii, from which it may be distinguished by its larger valves (>70-80 µm long) and finer, more closely spaced areolae (>12-14 in 10 µm). Stauroneis subborealis has a lower stria density, less radiate striae and proximal raphe ends that are curved, rather than straight.

LM scalebar = 10 µm
Stauroneis beeskovea LM5 Stauroneis beeskovea LM4 Stauroneis beeskovea LM3 Stauroneis beeskovea LM2 Stauroneis beeskovea LM1
Length Range
93-137 µm
Width Range
14-20 µm
Striae in 10 µm
21-24

Stauroneis subborealis

L.L.Bahls 2010

Stauroneis subborealis LM7 Stauroneis subborealis LM6 Stauroneis subborealis LM5 Stauroneis subborealis LM4 Stauroneis subborealis LM3 Stauroneis subborealis LM2 Stauroneis subborealis LM1
Length Range
46-142 µm
Width Range
9-24 µm
Striae in 10 µm
17-20

Also compare to

Stauroneis mangelsdorffii

Metzeltin and Lange-Bert.