Nitzschia filiformis

(W. Smith) Schütt 1896      Category: Nitzschioid
BASIONYM: Homoecladia filiformis W. Smith 1856

Nitzschia exilis


Nitzschia fonticola

LM scalebar = 10 µm = 40 pixels.


Contributor: Pat Kociolek - September 2011
Length Range: 27-150 µm
Width Range: 4.0-5.0 µm
Striae in 10 µm: 29-34


The valves are linear to linear-lanceolate, with apices acutely rounded. The raphe keel is not positioned on the margin, but slightly off the margin. Fibulae are distinct, irregular in size, and relatively broad and with a density of 7-9 in 10 µm. A prominent central nodule is present. Striae are indistinctly punctate and fine, but visible under LM.

Original Description

Basionym: Homoecladia filiformis
Author: W. Smith 1856
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Nitzschia filiformis. In Diatoms of the United States. Retrieved September 25, 2016, from

Species: Nitzschia filiformis

Contributor: Pat Kociolek

Reviewer: Loren Bahls


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. (1853). Synopsis of British Diatomaceae. John Van Voorst, London 1853. 89 pp., pls 1-31.

Van Heurck, H. (1896). A Treatise on the Diatomaceae. Translated by W.E. Baxter. William Wesley & Son, London. 558 pp., 35 pls.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Nitzschia filiformis CAS

NCBI Genbank Taxonomy

Nitzschia filiformis NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 48145

Autecology Discussion