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Navicula weberi

L.L.Bahls 2012      Category: Symmetrical biraphid

Navicula walkeri


Navicula whitefishensis

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - March 2012
Length Range: 29-58 µm
Width Range: 7.3-10.3 µm
Striae in 10 µm: 9-10


Valves are elliptic-lanceolate to broadly lanceolate, with obtusely rounded apices. The raphe is weakly lateral. Proximal raphe ends are deflected to the secondary side. Distal raphe fissures are hooked to the secondary side. The axial area is very narrow. The central area is moderately large, rounded and asymmetric. Striae are radiate, becoming convergent at the apices. Areolae are coarse, easily distinguished in LM and number 24 in 10 μm.

Original Description

Author: L.L.Bahls 2012
Length Range: 29-57 µm
Width Range: 7.3-10.3 µm
Striae in 10 µm: 9-10

Original Description

Valves elliptic-lanceolate to broadly lanceolate with obtusely rounded ends, 29 – 57 μm long, 7.3 –10.3 μm wide. Raphe weakly lateral, proximal endings deflected to the secondary side, distal raphe fissures hooked to the secondary side. Axial area very narrow, central area moderately large, rounded and asymmetric. Striae radiate, becoming convergent at the ends, 9 –10 in 10 μm, lineolae coarse, 24 in 10 μm, easily distinguished in LM. For measurements, n = 23.

Original Images

Cite This Page:
Bahls, L. (2012). Navicula weberi. In Diatoms of the United States. Retrieved May 22, 2018, from

Species: Navicula weberi

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

Navicula weberi has been collected from 20 lakes and streams in the Northern Rocky Mountains of western Montana, where it is present in low numbers. Here it prefers alkaline waters (pH range = 7.4-9.1) with low to moderate levels of electrolytes (specific conductance range = 49-256 μS/cm).


Our Lake in the Bob Marshall Wilderness near Choteau, Montana. Our Lake is home to Navicula weberi.

Credit/Source: Loren Bahls