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Diatoms of the United States is now known as Diatoms of North America.
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Nitzschia regula var. robusta

Hust. 1924      Category: Nitzschioid

REPORTED AS: Nitzschia intermedia (Krammer and Lange-Bertalot 1988) | Nitzschia regula (Lange-Bertalot and Metzeltin 1996) 

Nitzschia recta


Nitzschia reversa

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - May 2012
Length Range: 50-101 µm
Width Range: 5.2-7.4 µm
Striae in 10 µm: 23-25


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

Author: Hust. 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 22, 2018, from

Species: Nitzschia regula

Contributor: Loren Bahls

Reviewer: Rex Lowe


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)


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.


Paradise Pond below Rising Wolf Mountain, Glacier National Park, Montana: home of Nitzschia regula var. robusta.

Credit/Source: Loren Bahls