Stauroneis kootenai
Bahls 2010 Category: Symmetrical biraphid
BASIONYM: Stauroneis kootenai Bahls 2010
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Loren Bahls - December 2011
Length Range: 34-52 µm
Width Range: 8.1-10.3 µm
Striae in 10 µm: 20-28
Description
Valves are lanceolate with capitate apices. Raphe is slightly lateral, becoming filiform at the distal and proximal ends. Proximal raphe ends are straight and not inflated. The axial area is narrow and linear, barely wider than the raphe, flaring slightly into the central area. The central area is a narrow stauros. Striae are radiate throughout. Areolae are fine, round to oblong, irregularly spaced, and number 20-26 in 10 µm.
Original Description
Basionym: Stauroneis kootenai
Author: Bahls 2010
Length Range: 34-52 µm
Width Range: 8.1-10.3 µm
Striae in 10 µm: 20-28
Original Description
Valves lanceolate with capitate to subcapitate ends. Length 34-52 µm, width 8.1-10.3 µm. Raphe slightly lateral, becoming filiform at the distal and proximal endings. Proximal raphe ends small and straight, not inflated or deflected. Axial area narrow and linear, barely wider than the raphe, flaring slightly at the central area. Central area a narrow rectangular fascia. Striae radiate throughout, 20-28 in 10 µm. Striae puncta fine, round to oblong, and irregularly spaced, 20-26 in 10 µm. For measurements, n = 24 valves.
Original Images
Cite This Page:
Bahls, L. (2011). Stauroneis kootenai. In Diatoms of the United States. Retrieved June 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_kootenai
Species: Stauroneis kootenai
Contributor: Loren Bahls
Reviewer: Marina Potapova
Image Credit: Loren Bahls
- Valves lanceolate
- Apices capitate
- Areolae easily resolved in LM
Valves are lanceolate, 34-52 µm long. The apices are capitate. Areolae are easy to resolve in LM.
Compare
Stauroneis kootenai may be distinguished from Stauroneis gracilior by the lack of hyaline areas adjacent to the stauros. It differs from Stauroneis pikuni by having more robust valves and a smaller size. Stauroneis bryocola has rostrate apices. Stauroneis neohyalina has linear-lanceolate valves, rostrate to subcapitate apices and much finer striae and areolae. Stauroneis subgracilior has smaller valves with very narrow rostrate-capitate apices and very fine striae and areolae. Stauroneis schroederi has very narrow rostrate to subcapitate apices.
Stauroneis bryocola
Stauroneis neohyalina
Stauroneis pikuni
Stauroneis schroederi
Stauroneis gracilior
(Rabenhorst) Reichardt
Stauroneis subgracilior
Lange-Bertalot, Cavacini, Tagliaventi, & Alfinito
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.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Stauroneis kootenai has been found in several lakes, ponds, fens, and low-gradient streams in western Montana. The pH of these waters ranges from 6.7 to 7.8 and specific conductance ranges from 22 to 169 µS/cm.
Images
Spring pool on Kintla Lake Trail, Glacier National Park, Montana: type locality of Stauroneis kootenai.
Credit/Source: Mike Pasichnyk