Stauroneis superkuelbsii

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

Stauroneis supergracilis

 

Stauroneis thompsonii

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - December 2011
Length Range: 80-156 µm
Width Range: 18-34 µm
Striae in 10 µm: 15-18

Description

Valves are lanceolate to linear-lanceolate with subrostrate, broadly rounded apices. The axial area is quite broad, three to four times wider than the raphe, and widens markedly near the central area. The central area is a rather narrow rectangular stauros, hardly expanded toward the valve margins. Short striae are sometimes present at the margins of the central area. Raphe branches are lateral. Proximal raphe ends are curved toward the secondary side and weakly inflated. Striae are curved and radiate throughout, more so towards the apices. Areolae appear relatively coarse and number 13-17 in 10 µm. Areolae are somewhat transapically elongated throughout, and those comprising striae adjacent to the central area are markedly elongated.



Original Description

Basionym: Stauroneis superkuelbsii
Author: Bahls 2010
Length Range: 80-156 µm
Width Range: 18-30 µm
Striae in 10 µm: 15-18

Original Description

Valves lanceolate to linear-lanceolate with subrostrate, broadly rounded ends. Length 80-156 µm, width 18-30 µm. Length to width ratio: 4.2-5.5. Axial area quite broad, expanding near the central area in a deltoid manner. Central area rather narrow, hardly expanding toward the valve margins. Short striae sometimes present at the margins. Raphe fissures lateral, proximal endings with small pores and curved toward the secondary side. Terminal endings are hooked, also toward the secondary side. Striae curved and radiate throughout, more so toward the valve ends, 15-18 in 10 µm. Striae puncta appear relatively coarse, 13-17 in 10 µm. Foramina of puncta somewhat elongated throughout; those comprising striae adjacent to the central area are markedly elongated. For measurements, n = 32 valves.

Original Images


Cite This Page:
Bahls, L. (2011). Stauroneis superkuelbsii. In Diatoms of the United States. Retrieved July 25, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_superkuelbsii

Species: Stauroneis superkuelbsii

Contributor: Loren Bahls

Reviewer: Pat Kociolek

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 superkuelbsii CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Stauroneis superkuelbsii is widely distributed in lakes and ponds throughout the Northern Rockies. The pH of these waters ranges from 7.2 to 9.1 and specific conductance ranges from 35 to 465 µS/cm.

Images

Cut Bank Pond, Glacier National Park, Montana: type locality for Stauroneis superkuelbsii.

Credit/Source: Loren Bahls