Nitzschia regula var. robusta
Hustedt 1924 Category: Nitzschioid
BASIONYM: Nitzschia regula var. robusta Hustedt 1924
REPORTED AS: Nitzschia intermedia (Krammer and Lange-Bertalot 1988) | Nitzschia regula (Lange-Bertalot and Metzeltin 1996)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - May 2012
Length Range: 50-101 µm
Width Range: 5.2-7.4 µm
Striae in 10 µm: 23-25
Description
Valves are linear with short, wide, subcapitate apices. Fibulae are distinct and number 9-12 in 10 µm. The central two fibulae are equidistant and a central nodule is lacking. Striae are indistinctly punctate.
Original Description
Basionym: Nitzschia regula var. robusta
Author: Hustedt 1924
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Nitzschia regula. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/nitzschia_regula_var._robusta
Species: Nitzschia regula
Contributor: Loren Bahls
Reviewer: Rex Lowe
Image Credit: Loren Bahls
- Valves linear
- Apices short, wide, subcapitate
- Fibulae distinct, 9-12 in 10 µm
- Central nodule lacking
- Striae 23-25 in 10 µm
Valves are linear with short, wide, subcapitate apices. Fibulae are distinct and number 9-12 in 10 µm. A central nodule is lacking. Striae number 23-25 in 10 µm.
Compare
This variety has shorter and wider apices than the nominate variety. Nitzschia gracilis and N. intermedia have narrower apices and more closely spaced striae.
Nitzschia intermedia
Hantzsch
Nitzschia regula
Hustedt
Nitzschia gracilis
Hantzsch
Citations
Hustedt, F. (1924). Die Bacillariaceen-Vegetation des Sarekgebirges. Naturwiss. Untersuch. des Sarekgeb. in Schwed.-Lappland, 3 (Bot.): 525-626.
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)
Nitzschia regula var. robusta CAS
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Nitzschia regula var. robusta has been found in a few cold-water and circumneutral ponds and streams with low levels of electrolytes in the Northern Rocky Mountains of Montana and Alberta. This taxon was described from samples collected in Swedish Lapland.
Images
Paradise Pond below Rising Wolf Mountain, Glacier National Park, Montana: home of Nitzschia regula var. robusta.
Credit/Source: Loren Bahls