Stauroneis separanda

Lange-Bertalot and Werum in Werum and Lange-Bertalot 2004      Category: Symmetrical biraphid
BASIONYM: Stauroneis separanda Lange-Bertalot and Werum in Werum and Lange-Bertalot 2004

Stauroneis schroederi


Stauroneis siberica

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - December 2012
Length Range: 13.9-15.3 µm
Width Range: 3.8-4.8 µm
Striae in 10 µm: 30


Valves are linear-lanceolate with triundulate margins and short rostrate-apiculate apices. Valves are widest at the center. A pseudoseptum is present at each apex. The axial area is very narrow and linear, becoming wider near the central area. The central stauros is narrow and linear. The raphe is filiform with straight and weakly inflated proximal ends. Striae are parallel at the center to weakly radiate near the apices. Areolae are very fine and difficult to resolve in LM.

Original Description

Basionym: Stauroneis separanda
Author: Lange-Bertalot and Werum in Werum and Lange-Bertalot 2004
Length Range: 13-17 µm
Width Range: 3.6-4.7 µm
Striae in 10 µm: 27-29

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Stauroneis separanda. In Diatoms of the United States. Retrieved November 27, 2015, from

Species: Stauroneis separanda

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Werum, M. and Lange-Bertalot, H. (2004). Diatoms in springs, from Central Europe and elsewhere under the influence of hydrogeology and anthropogenic impages. Iconographia Diatomologica 13: 1-417.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Stauroneis separanda CAS

North American Diatom Ecological Database (NADED)

NADED ID: 62112

Autecology Discussion

Werum & Lange-Bertalot (2004) report that S. separanda is widely distributed in chalk-rich springs in Europe. It is probably also common in head-water habitats in North America, but under-reported here because of its close resemblance to the more familiar S. smithii.


Blakiston Beaver Pond A on Blakiston Creek in Waterton Lakes National Park, Alberta: home of Stauroneis separanda.

Credit/Source: Barb Johnston, Parks Canada