Compare

Stauroneis baileyi and S. rex have longer and wider valves with more widely spaced striae. Stauroneis gracilis has curved proximal raphe ends.

LM scalebar = 10 µm
Stauroneis phoenicenteron LM5 Stauroneis phoenicenteron LM4 Stauroneis phoenicenteron LM3 Stauroneis phoenicenteron LM2 Stauroneis phoenicenteron LM1
Length Range
129-199 µm
Width Range
26-35 µm
Striae in 10 µm
15-18

Stauroneis rex

L.L.Bahls 2010

Stauroneis rex LM6 Stauroneis rex LM2 Stauroneis rex LM5 Stauroneis rex LM1 Stauroneis rex LM3 Stauroneis rex LM7
Length Range
215-386 µm
Width Range
38-60 µm
Striae in 10 µm
12-14

Stauroneis gracilis

Ehrenb. 1843

Stauroneis gracilis LM7 Stauroneis gracilis LM6 Stauroneis gracilis LM1 Stauroneis gracilis LM4 Stauroneis gracilis LM3 Stauroneis gracilis LM2
Length Range
68-127 µm
Width Range
13-22 µm
Striae in 10 µm
15-18

Also compare to

Stauroneis baileyi

Ehrenb.