Stauroneis vandevijveri
Bahls 2010 Category: Symmetrical biraphid
BASIONYM: Stauroneis vandevijveri Bahls 2010
REPORTED AS: Stauroneis “arctic-anceps” manuscript name (Van de Vijver et al. 2004, Pl. 39, Figs 1-10)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - December 2011
Length Range: 48-73 µm
Width Range: 9.5-12.5 µm
Striae in 10 µm: 19-23
Description
Valves are lanceolate with rostrate to subcapitate apices. The axial area is narrow and linear, not widening towards the central area. The stauros is broad, expanded toward the valve margins like a bow tie. External raphe fissures are weakly lateral. Proximal raphe ends are straight and not expanded. Striae are radiate throughout and curved near the central area. Areolae are very fine and number 24-28 in 10 µm.
Original Description
Basionym: Stauroneis vandevijveri
Author: Bahls 2010
Length Range: 48-73 µm
Width Range: 9.5-12.5 µm
Striae in 10 µm: 19-23
Original Description
Valves lanceolate with rostrate to subcapitate ends. Length 48-73 µm, width 9.5-12.5 µm. Axial area narrow, linear, not widening towards the central area. Central area a broad fascia, expanded toward the valve margins. Raphe weakly lateral, proximal endings practically straight, central pores not inflated. Striae curved, radiate throughout, 19-23 in 10 µm. Striae puncta very fine, 24-28 in 10 µm. For measurements, n = 25 valves.
Original Images
Cite This Page:
Bahls, L. (2011). Stauroneis vandevijveri. In Diatoms of the United States. Retrieved June 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_vandevijveri
Species: Stauroneis vandevijveri
Contributor: Loren Bahls
Reviewer: Sarah Spaulding
Image Credit: Loren Bahls
- Valves lanceolate
- Apices rostrate to subcapitate
- Stauros broad
- Proximal raphe ends straight
- Axial area narrow and linear
Stauroneis vandevijveri has lanceolate valves with rostrate to subcapitate apices. The axial area is narrow and linear; the stauros is broad and shaped like a bow tie. External proximal raphe ends are straight and not expanded.
Compare
Stauroneis vandevijveri may be distinguished from S. acidoclinata by its more lanceolate, rather than linear, valves and straight proximal raphe ends. Stauroneis absaroka has a broad axial area and distinctly curved, drop-like proximal raphe ends. Stauroneis anceps has narrower, rostrate apices. Stauroneis ancepsfallax has capitate apices.
Stauroneis absaroka
Stauroneis acidoclinata
Stauroneis ancepsfallax
Stauroneis anceps
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)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Stauroneis vandevijveri has been recorded from two ponds in southwestern Montana, where pH measured 6.5 and 7.8 and specific conductance measured 25 and 27 µS/cm. This taxon was reported as Stauroneis arctic-anceps (invalid manuscript name) from a shallow ditch in the Russian Arctic (Van de Vijver et al. 2004).
Images
Bloody Dick Pond #1, Beaverhead County, Montana: type locality for Stauroneis vandevijveri.
Credit/Source: Loren Bahls