Nitzschia clausii

Hantzsch 1860      Category: Nitzschioid
BASIONYM: Nitzschia clausii Hantzsch 1860
SYNONYM(S): Nitzschia sigma var. clausii (Hantzsch) Grunow 

Nitzschia brevissima


Nitzschia columbiana

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - September 2011
Length Range: 20-68 µm
Width Range: 3.0-5.0 µm
Striae in 10 µm:


In girdle view, the frustules are distinctly sigmoid. Valves are linear and slightly concave at the center. The apices are distinctly rounded, capitate or rostrate and bent to form a sigmoid valve shape. The striae are very fine. The keeled raphe is distinct, with robust fibulae. Fibula density is 10-13 in 10 µm.

Krammer and Lange-Bertalot (1988, Plate 19, Figs 1-6A) illustrate longer specimens of this species (e.g. Fig. 5) that are narrower than the shorter specimens (e.g. Fig. 1), suggesting that more than one taxon might be included in their concept of the species.

Original Description

Basionym: Nitzschia clausii
Author: Hantzsch 1860
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Nitzschia clausii. In Diatoms of the United States. Retrieved September 29, 2016, from

Species: Nitzschia clausii

Contributor: Pat Kociolek

Reviewer: Loren Bahls


Hantzsch, C. A. (1860). Neue Bacillarien: Nitzschia vivax var. elongata, Cymatopleura nobilis. Hedwigia 2(7):40, pl. 6.

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.

Rabenhorst, L. (1860). Die Algen Sachsens resp. Mittel-Europa’s. Decas 95-96. no. 943-953 etc. .

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Nitzschia clausii CAS

North American Diatom Ecological Database (NADED)

NADED ID: 48137

Autecology Discussion