Stauroneis pseudagrestis

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

Stauroneis pikuni

 

Stauroneis reichardtii

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2012
Length Range: 27-43 µm
Width Range: 6.4-9.4 µm
Striae in 10 µm: 23-26

Description

Valves are lanceolate with capitate apices. The axial area is narrow and widens very little or not at all near the central area. The stauros is a very broad, with curved striae on the margins. The raphe is filiform with unexpanded proximal ends that are bent slightly in the same direction. Striae are strongly radiate. Areolae are difficult to resolve in LM and number about 30 in 10 µm.



Original Description

Basionym: Stauroneis pseudagrestis
Author: Lange-Bertalot and Werum 2004
Length Range: 26-35 µm
Width Range: 6.5-7.0 µm
Striae in 10 µm: 24-27

Original Description

Original Images


Cite This Page:
Bahls, L. (2012). Stauroneis pseudagrestis. In Diatoms of the United States. Retrieved August 20, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_pseudagrestis

Species: Stauroneis pseudagrestis

Contributor: Loren Bahls

Reviewer: Rex Lowe

Citations

Bahls, L. (2010). Stauroneis in the Northern Rockies: 50 species of Stauroneis sensu stricto from western Montana, northern Idaho, northeastern Washington and southwestern Alberta, including 16 species described as new. Northwest Diatoms, Volume 4. The Montana Diatom Collection, Helena, 172 pp.

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 pseudagrestis CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Stauroneis pseudagrestis is uncommon in the U. S. and reported to date only from three small lakes and ponds in southwestern Montana. Here it prefers slightly alkaline water (pH 7.34-7.83) with low specific conductance (31-41 µS/cm). This species was described from springs in Germany.

Images

Bloody Dick Pond No. 6, Beaverhead County, Montana: home of Stauroneis pseudagrestis.

Credit/Source: Loren Bahls