Nitzschia sinuata

(Thwaites in W. Smith) Grunow in Cleve and Grunow 1880      Category: Nitzschioid
BASIONYM: Denticula sinuata Thwaites in W. Smith 1856

REPORTED AS: Nitzschia sinuata (Krammer and Lange-Bertalot 1988, p. 52, fig. 40: 1-4.) 

Nitzschia sigma


Nitzschia sinuata var. tabellaria

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2014
Length Range: 23-44 µm
Width Range: 6.2-8.5 µm
Striae in 10 µm: 18-21


Valves are linear-lanceolate, with triundulate margins and capitate apices. Fibulae are very large, occupy about one-half the valve face, and number 3-7 in 10 µm. Striae are distinctly punctate and weakly radiate. The raphe appears to be continuous through the central valve, as the central fibulae lack a distinctive gap. (Note that some authors express this feature by stating that the “central nodule is absent”).

Original Description

Basionym: Denticula sinuata
Author: Thwaites in W. Smith 1856
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bahls, L. (2014). Nitzschia sinuata. In Diatoms of the United States. Retrieved September 25, 2016, from

Species: Nitzschia sinuata

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arktischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, 17(2): 121 pp., 7 pls.

Krammer, K. and Lange-Bertalot, H. (1988). Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/2. Gustav Fisher Verlag, Jena.

Smith, W. (1856). Synopsis of British Diatomaceae. John Van Voorst, London 1856. 2: 107pp., pls. 32-60, 61-62, A-E.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Nitzschia sinuata CAS

North American Diatom Ecological Database (NADED)

NADED ID: 48096

Autecology Discussion

Nitzschia sinuata var. sinuata is uncommon in the benthos of shallow calcareous lakes and ponds of the northern Rocky Mountains. Here it is found at pH values ranging from 8.50 to 9.05 and specific conductance levels ranging from 105 to 181 µS/cm.


Lower Wolverine Pond, Ten Lakes Scenic Area, Kootenai National Forest, Lincoln County, Montana: home of Nitzschia sinuata var. sinuata.

Credit/Source: Loren Bahls