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Stauroneis supergracilis has narrower valves relative to their length, more subtly protracted apices, and a lower areolae density (14-18 in 10 µm). Valves of S. subborealis are more linear, especially in small specimens. Stauroneis phoenicenteron lacks protracted apices and has straight proximal raphe ends.

LM scalebar = 10 µm
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

Stauroneis phoenicenteron

(Nitzsch) Ehrenb. 1843

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 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

Stauroneis supergracilis

Van de Vijver and Lange-Bert. 2004

Stauroneis supergracilis LM14 Stauroneis supergracilis LM13 Stauroneis supergracilis LM11 Stauroneis supergracilis LM10 Stauroneis supergracilis LM12 Stauroneis supergracilis LM1 Stauroneis supergracilis LM7
Length Range
124-213 µm
Width Range
21-33 µm
Striae in 10 µm
15-16