Stauroneis lauenburgiana
Hustedt 1950 Category: Symmetrical biraphid
BASIONYM: Stauroneis lauenburgiana Hustedt 1950
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - December 2011
Length Range: 37-50 µm
Width Range: 9-11 µm
Striae in 10 µm: 18-22
Description
Valves are linear to linear-elliptic with convex to nearly parallel sides, narrowing to rostrate to capitate apices. Pseudosepta are present but positioned very near the valve ends. Raphe branches are filiform and straight. Proximal raphe ends are straight and slightly inflated. The axial area is narrow and linear, and typically bordered on each side by an uninterrupted longitudinal row of areolae. The central area is a rectangular stauros, sometimes oriented somewhat obliquely. Striae are parallel at the center, becoming weakly radiate towards the apices. Areolae are coarse, transversely oblong, and irregularly spaced and number 12-16 in 10 µm.
Original Description
Basionym: Stauroneis lauenburgiana
Author: Hustedt 1950
Length Range: 32-40 µm
Width Range: 10-11 µm
Striae in 10 µm: 18-21
Original Description
Original Images
Cite This Page:
Bahls, L. (2011). Stauroneis lauenburgiana. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_lauenburgiana
Species: Stauroneis lauenburgiana
Contributor: Loren Bahls
Reviewer: Mark Edlund
Image Credit: Loren Bahls
- Valves linear to linear-elliptic
- Areolae coarse
- Areolae form longitudinal lines along axial area
- Pseudosepta present
Stauroneis lauenburgiana has linear to linear-elliptic valves less than 50 µm long. Shallow pseudosepta are present. Areolae are coarse, transversely oblong and irregularly spaced. Areolae form an uninterrupted longitudinal line along each side of the axial area.
Compare
Stauroneis lauenburgiana belongs to the group of Stauroneis species that have oblong and irregularly spaced areolae. It is the only species in this group with largely linear valves that do not exceed 50 µm in length. Stauroneis livingstonii has linear-elliptic valves but has much finer striae and puncta and deep pseudosepta. Stauroneis baconiana is larger, has linear-lanceolate valves and lacks pseudosepta. Stauroneis siberica has lanceolate valves, finer striae and areolae and lacks pseudosepta.
Stauroneis baconiana
Stauroneis siberica
Stauroneis livingstonii
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.
Hustedt, F. (1950). Die Diatomeenflora norddeutscher Seen mit besonderer Berücksichtigung des holsteinischen Seengebiets V-VII. Seen in Mecklenburg, Lauenburg und Nordostdeutschland. Archiv für Hydrobiologie 43:329-458, Tafs 21-41.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 62010
Autecology Discussion
Stauroneis lauenburgiana has been found in several lakes, ponds, marshes, and spring pools in Glacier National Park, Waterton Lakes National Park, and elsewhere in the Northern Rockies, but nowhere is it found in abundance. The pH of these waters ranges from 6.1 to 8.6 and specific conductance ranges from 75 to 332 µS/cm. Hustedt (1950) described this species from lakes in northern Germany.
Images
A spring pool along the Kintla Lake Trail, Glacier National Park, Montana: home of Stauroneis lauenburgiana.
Credit/Source: Mike Pasichnyk