Stauroneis subborealis

Bahls 2010      Category: Symmetrical biraphid
BASIONYM: Stauroneis subborealis Bahls 2010

Stauroneis sonyae

 

Stauroneis submarginalis

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - December 2011
Length Range: 46-142 µm
Width Range: 9-24 µm
Striae in 10 µm: 17-20

Description

Valves are linear in small specimens to lanceolate in larger specimens, with protracted and broadly rounded apices. The axial area is narrow and widens slightly near the central area. The stauros is narrow, somewhat expanded toward the valve margins, and occasionally contains short striae at the margins. Raphe branches are lateral. Proximal raphe ends are inflated and curved. Terminal raphe fissures are hooked. Striae are radiate throughout. Areolae number 18–22 in 10 µm.



Original Description

Basionym: Stauroneis subborealis
Author: Bahls 2010
Length Range: 46-142 µm
Width Range: 9-24 µm
Striae in 10 µm: 17-20

Original Description

Valves are linear in small specimens to lanceolate in larger specimens, with protracted and broadly rounded apices. Length 46–142 µm, width 9–24 µm. Length to width ratio: 4.9-6.6. Axial area narrow, widening slightly near the central area. Transverse fascia narrow, somewhat expanded toward the valve margins, occasionally containing short striae. Raphe fissures lateral, proximal endings inflated and curved. Terminal raphe fissures hooked. Striae radiate throughout, 17–20 in 10 µm. Striae puncta 18–22 in 10 µm. For measurements, n = 31 valves.

Original Images


Cite This Page:
Bahls, L. (2011). Stauroneis subborealis. In Diatoms of the United States. Retrieved December 19, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_subborealis

Species: Stauroneis subborealis

Contributor: Loren Bahls

Reviewer: Mark Edlund

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.

Van de Vijver, B., Beyens, L. and Lange-Bertalot, H. (2004). The genus Stauroneis in Arctic and Antarctic Regions. Bibliotheca Diatomologica 50, 312 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Stauroneis subborealis CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Stauroneis subborealis has been found in a few fens, ponds, and small lakes in western Montana. The pH of these waters ranges from 6.2 to 9.1 and specific conductance ranges from 10 to 257 µS/cm.

Images

Drosera Fen, Indian Meadows Research Natural Area, Helena National Forest, Montana: type locality for Stauroneis subborealis.

Credit/Source: Loren Bahls