Compare

Stauroneis pikuni lacks the hyaline areas in the striae adjacent to the central area that are characteristic of Stauroneis gracilior. It is also larger than S. gracilior and has somewhat finer (more closely spaced) striae and puncta. Stauroneis pikuni has larger and more gracile valves than S. kootenai. Stauroneis neohyalina has linear-lanceolate valves and much finer striae and puncta. Stauroneis schroederi has strictly lanceolate valves with very narrow rostrate to subcapitate apices.

LM scalebar = 10 µm
Stauroneis pikuni LM7 Stauroneis pikuni LM6 Stauroneis pikuni LM5 Stauroneis pikuni LM4 Stauroneis pikuni LM3 Stauroneis pikuni LM2 Stauroneis pikuni LM1
Length Range
53-64 µm
Width Range
9.0-12.0 µm
Striae in 10 µm
24-28

Stauroneis kootenai

L.L.Bahls 2010

Stauroneis kootenai LM5 Stauroneis kootenai LM4 Stauroneis kootenai LM3 Stauroneis kootenai LM2 Stauroneis kootenai LM1
Length Range
34-52 µm
Width Range
8.1-10.3 µm
Striae in 10 µm
20-28

Stauroneis neohyalina

Lange-Bert. and Krammer 1996

Stauroneis neohyalina LM6 Stauroneis neohyalina LM5 Stauroneis neohyalina LM4 Stauroneis neohyalina LM3 Stauroneis neohyalina LM2 Stauroneis neohyalina LM1
Length Range
32-49 µm
Width Range
6.0-9.0 µm
Striae in 10 µm
32-40

Stauroneis schroederi

Hust. in A.Schmidt 1913

Stauroneis schroederi LM6 Stauroneis schroederi LM5 Stauroneis schroederi LM4 Stauroneis schroederi LM3
Length Range
40-64 µm
Width Range
7.4-11.1 µm
Striae in 10 µm
24-28

Also compare to

Stauroneis gracilior

(Rabenh.) E.Reichardt