Visit us at

Diatoms of the United States is now known as Diatoms of North America.
This site has been redesigned and updated, and will be closing soon.

Nitzschia exilis

Sovereign 1958      Category: Nitzschioid

Nitzschia dissipata subsp. oligotraphenta


Nitzschia filiformis

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - February 2011
Length Range: 24-64 µm
Width Range: 2-3 µm
Striae in 10 µm: Not visible in the light microscope


Valves are delicate, narrowly lanceolate with rostrate and subcapitate apices. Keel strongly excentric, fibulae 15-17 in 10 µm and of differing sizes. The striae are not resolvable in the light microscope.

This specimen is easily overlooked in sample due to their delicate nature. Found in low numbers throughout the Pacific Northwest.

Original Description

Author: Sovereign 1958
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Nitzschia exilis. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Nitzschia exilis

Contributor: Pat Kociolek

Reviewer: Marina Potapova


Sovereign, H.E. (1958). The diatoms of Crater Lake, Oregon. Transactions of the American Microscopical Society 77(2):96-134.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Nitzschia exilis CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion