The rhombic-lanceolate valves, acutely rounded apices, and straight, weakly expanded proximal raphe ends make S. acuta distinctly different from most other large Stauroneis species with pseudosepta. Stauroneis terryi attains a much larger size and has a wider raphe and axial area.

LM scalebar = 10 µm
Length Range
121-175 µm
Width Range
21-29 µm
Striae in 10 µm
12-15
Stauroneis acuta LM5
Stauroneis acuta LM4
Stauroneis acuta LM3
Stauroneis acuta LM2
Stauroneis acuta LM1
Stauroneis acuta LM5 Stauroneis acuta LM4 Stauroneis acuta LM3 Stauroneis acuta LM2 Stauroneis acuta LM1

Also compare to

Stauroneis terryi

D.B.Ward