Stauroneis fluminopsis may be distinguished from S. fluminea by its wider valves, narrower stauros, less steeply radiate striae, and more widely spaced striae and areolae. Stauroneis fluminopsis differs from S. respectabilis by its somewhat smaller size and more linear valve shape. Stauroneis amphicephala is smaller and has more distinctly protracted ends and a wider, more marginally expanded stauros.

LM scalebar = 10 µm
Stauroneis fluminopsis LM6 Stauroneis fluminopsis LM5 Stauroneis fluminopsis LM4 Stauroneis fluminopsis LM3 Stauroneis fluminopsis LM2 Stauroneis fluminopsis LM1
Length Range
76-101 µm
Width Range
17-22 µm
Striae in 10 µm

Stauroneis amphicephala

Kütz. 1844

Stauroneis amphicephala LM5 Stauroneis amphicephala LM4 Stauroneis amphicephala LM3 Stauroneis amphicephala LM2 Stauroneis amphicephala LM1 Stauroneis amphicephala LM6
Length Range
55-82 µm
Width Range
11.0-16.8 µm
Striae in 10 µm

Also compare to

Stauroneis fluminea

R.M.Patrick and Freese

Stauroneis respectabilis

Lange-Bert., Cavacini, Tagliaventi, and Alfinito