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
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Loren Bahls - December 2012
Length Range: 13.9-15.3 µm
Width Range: 3.8-4.8 µm
Striae in 10 µm: 30
Description
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 March 11, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_separanda
Species: Stauroneis separanda
Contributor: Loren Bahls
Reviewer: Sarah Spaulding
Image Credit: Loren Bahls
- Valves triundulate
- Pseudosepta present
- Apices rostrate-apiculate
Stauroneis separanda has triundulate valves, less than 20 µm long with rostrate-apiculate apices. A pseudoseptum is present at each valve apex.
Compare
Valves of S. smithii are longer than 20 µm and the smallest valves of this species have a smooth rather than a triundulate outline.
Stauroneis smithii
Citations
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)
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.
Images
Blakiston Beaver Pond A on Blakiston Creek in Waterton Lakes National Park, Alberta: home of Stauroneis separanda.
Credit/Source: Barb Johnston, Parks Canada